Me too. If I weren’t married I’d have to dig a real pit and throw money into it to keep the stuff from piling up all over the place.
I dug mine, 8’ x 8’ x 4’, and mixed the concrete. The lined pool I dug some of and paid a guy from work to dig some.
I don’t have much money in them, no filters for example.
My Wife and I share the money pit of marine aquariums. I wish I were putting that money into an IRA. 
Reminds me of a handmade plywood sign on the back of an old rustbucket pickup in Alaska: Only 23 more payments and it’s mine, ALL MINE!
My kids were, but maybe they don’t count since both are now gainfully employed. When my youngest was in junior high and high school it was riding lessons, shows, and her horse - when she went to an out of state State college and we could donate the horse, our monthly payments didn’t go up much.
No others. My hobbies are cheap, which is why I have enough money to retire on.
I’ve spent thousands on bass guitars and related equipment like amps, heads, pedals. I have electrics and acoustics, I feel I am very talented at the instrument maybe even close to virtuoso level but it’s only something enjoyable to me personally, I’ll never be in a famous band, but a man can dream!
Fishing.
Got lucky and bought a very under priced used Lund last Fall:).
I’ve finally accumulated all the rods, reels, and other gear that I need.
Hmmm, then why did I just spend $344 at Bass Pro yesterday?
I will be fishing my first bass tournament soon and am looking forward to it. The “draw” boat is a $75,000 BassCat !
As the saying goes: “If I die, the greatest fear I have, is that my wife will sell all my fishing gear for what I told her I paid for it”…
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Remembering, from long ago, reading the definition of being a boat owner: Standing in an ice-cold shower, ripping up hundred dollar bills. 
Trying to reduce my current money pit of a too large stash of yarn. I am crocheting things to give away, or sell for pennies, just to get the stuff out the door. My shelves full of quilting material? Oy, that stuff will outlast the pyramids.
Biggest moneypit I’ve ever had: flying airplanes
Second biggest: crafts
My dogs. I used to train and compete with them at a low level in a couple of different sports, but as they’ve gotten older I do less of that. I did start mushing with them, so that required purchase of harnesses and assorted odds and ends, a dog scooter for when there’s no snow, and for winter fun, a sled, and then a better sled. Plus trips to events.
I used to have a horse. That was an even bigger hole to throw money into, but I did have a lot of fun and miss it.
Boats. I’m 60 and have owned 10 so far. Number 10 is being polished and readied for sale (I’m happily shopping for number 11 as we speak),
Oh, and the planes… and the RVs… and the 4WD trucks… and all the hunting gear… and fishing…
I get waaay too into my hobbies.
Just empty every pocket
Food-n-booze. Those are they only two things I really enjoy spending money on. I hate owning things. Ok, maybe not “owning”, but “paying for” and then “worrying about”. If I get something nice for free or super super cheap, I don’t feel bad about using/damaging it/getting stolen. Also, the less I have, the less I have to move later.
My kids.
I Read this at first as “I take my horse for sailing lessons” THAT I want to see
Awww. I really didn’t mean it that way.
And I have to give her lots of credit for supporting me too. When it was time for a new plow truck, I shopped and shopped, trying to keep it under 10G or so. Found what I wanted and we needed, and it was no problem spending 20g on it to get it right. My Wife convinced me to do it. Then the Kubota tractor to back up the plow truck. Another 17g.
It’s much cheaper than moving. And we like were we live.
Are you my neighbor?
Are you me? (actually I’ve got six cars currently). My neighbor and I enable each other… It is much easier to justify something when you have a buddy letting you know what a great idea it is.
I always tell people how much (or rather how little) I spend on gas for the motorcycle, but somehow always forget to mention how much I spend on tires, chains, and all the other random repairs and maintenance that come up with annoying frequency.
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Travel. Ms Hook and I probably spend more than $30k a year on travel. It’ll be more this year. We’ve already spent 2 months in Arizona in our trailer. We’ll do another 2 months in the summer in it. In August/September we’re going to Africa, Greece, Turkey, Italy and Croatia.
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Woodworking. Got several thousand in tools and spend something over two thousand on wood every year.
But if you don’t spend it it just piles up around the house getting in they way. Makes dusting and general cleaning a real pain-in-the-butt.
My weakness is music. I own close to 10,000 CDs. I also own 7 guitars, a bass guitar, a drum kit, a couple of keyboards, 2 Klong Yaws, a few bongos, some congas, a saxophone and more assorted noisemakers of various ethnic/cultural origins than I can name. There is almost never a time that I am awake that I am not listening to music or actively making it. I don’t have to guess: I spend nearly 15% of my net income on music in some form or other.
My dog. I try not to think of how much his next dental visit will cost me.
I have one last dollhouse to assemble and furnish. It’s for me, so $$$.
The horse is gone, and all the spinning equipment and fiber and most of the yarn. But somehow my worktable is heaped with metal embossing and origami books and tools and supplies. Crafts. Futile to resist.