Simply because being in Love gives you a reason to get up as soon as you wake up (as opposed to sluggishly dragging yourself out of bed some two hours or more after waking)
It puts a spring in your step.
It makes you perform damn near to 100% of your capacity (sometimes it seems like beyond that)
Feel free to add your own benefits to being in Love.
Hey I’ll trade you - I need $2000+ worth of electronics and whatnot. Having the money to go on a little spree like that would make ME want to get out of bed in the morning 
How about I tell you I love you, and you send me money? 
You feel good pretty much all of the time. (Except when you feel like shit.)
You treat every member of the opposite sex like royalty, and they seem to appreciate it.
“Love”.
“Love”.
Just a minute…
Ah. You’re talking about some kind of recreational drig, is that it?
:: pages through book ::
No, wait, it’s the effect of spring. It’s soil outgassing and tree pollen. I recommend going outside and enjoying the warm sunshine and the new green of the leaves.
Spring!
Isn’t that how it usually works anyway?
Er well…I love you?
Why? The aching memories of the girl I had thought about for [mumble mumble] years was completely erased by a girl I recently met who treated me the way I wanted to be treated, like a decent human being instead of an object or an idiot or a wallet, something which only my lost love came close to doing, but could not because she was scared. I no longer pine over this after all those years, all from a simple 1 hour interaction.
I didn’t pursue this later relationship because I don’t want to be burned again.
It’s nice to have someone around to remind you to take care of yourself from time to time – and I guess it’s nice to have someone actually take care of you from time to time, too.
(Pretty far down the list, but I’m down with a nasty infection in my lungs today, so it’s the first thing that comes to mind, even before bone-rattling deity-invoking sex, which seems pretty remote and abstract just now, truth be told.) 
Presumably it allows you to tolerate Paul McCartney’s 'Eighties output without retching. I’m not sure that this is a good thing, though.
Stranger
Sorry, I’ve fallen for that one before! The key is finding an unsuspecting victim.
You should have this before you fall in love, to be in a place where you’re emotionally healthy enough to be in a loving relationship with someone.
Lobsang, I don’t know why I feel this way, but I think you’re one of the most lovable of all the Dopers. Don’t give up; someone will be lucky to have you.
I wouldn’t know, despite trying my best to be kind, physically fit, and stable emotionally and careerwise I have had no luck. I seriously doubt if it exists.
Sorry to rain on the parade but that’s how I feel.
Can’t remember! 
But I’d think your new toys should give you a reason to get up in the morning.
Oh, well, never mind - Hooray, hooray, the First of May …
The sheer euphoria during the early ‘honeymoon’ stage of the relationship. For me, there were moments where I could hardly believe I was so happy. It inevitable cooled down, but during that period I remember thinking ‘so this is what all the fuss is about’.
The first blush of love allows you to get by with virtually no sleep and still function at your peak in all departments. Normally I need the full 8 every night to feel that way. Make it a pill and you’ll be the next Bill Gates.
I hear the Spanish Inquisition has a lot of those.
::d+r::
True, but personally I’m so jaded I expect even the Spanish Inquisition.
Have at it, just pick someone who isn’t a fucked-up manipulative psychobitch, or at least doesn’t have all of those qualities.
Being in love makes all the crappy stuff just roll right off. Got a speeding ticket? Broke the heel off of your favorite shoe? No worries - there is a hug and a kiss waiting for you at home.