No.
I like tomato jam on hot dogs, smother-fried potatoes, and giant white lima beans. It just doesn’t seem to go with steak, though.
Location: Florida
No.
I’ll put a little ketchup on a burger, but a really good steak shouldn’t need anything more than salt and pepper and whatever spices went into the cooking. I’ll use A1 for lesser steaks.
I live in the Baltimore metro area. I don’t put ketchup on steak. Actually I don’t put anything on steak except salt.
I eat steak about twice a week because I love it bigtime and it’s low/no carb and fills me up. My fave cut is porterhouse/T-bone and ribeye in a pinch.
London broil rocks too. I grill one about twice a month and slice it off cold and chow on that during the week. I do marinate that. I use whatever marinade that looks good at the store, but I like Jim Beam marinade the best. Good steak it’s got to be. Bad steak hurts my teeth and is a waste of money and calories. Meat is pretty much all I eat.
But I take vitamins.
No. The only time I might consider putting ketchup on steak is if the steak is decidedly sub-par, poor quality, or otherwise not worthy of being called a Steak. And if it’s that, I won’t cook it as a steak; I’ll cut it up and make stir-fry or a sandwich or something.
Location: Washington State.
Absolutely not, for the reason Northern Piper stated - ketchup is wayyyyy to sweet for meats of any sort. I use it on fried potatos and once in a blue moon scrambled eggs and that’s about it.
Like Johnny L.A., I’m tolerant of a creamy/savory sauce. But typically I eat good quality steaks “plain” - i.e seasoned, but no sauces.
- Tamerlane
No. Growing up, my family never served steak with any kind of sauce, just salt and pepper. These days, I like a little A-1. I tend not to order steak in restaurants.
I now living in the far northwestern suburbs of Chicago, but I spent the first 42 years of my life in the NYC suburbs.
If I’m feeling especially demented, I might put a little bit of salt on a steak. I avoid steak sauce of any kind almost universally, and it’s never even occurred to me to let ketchup anywhere near my steak.
It would have to be one hell of a bad steak for me to put ketchup or any condiment other than a little garlic salt and pepper on it.
On re-reading, I have detected a typo.
For “HO sauce”, please read “HP sauce.”
And keep your dirty thoughts to yourselves. 
Good Og, no!
New York, now, but New England most of the time.
If I can’t afford a good steak, I’ll go without. I don’t even care for steak sauces. Either just some pepper and salt, or sauteed mushrooms and onions.
Then again, I have been told I have to turn in my citizenship card, anyways: I haven’t bought ketchup in three years, and don’t really miss it.
I do, if I know it’s going to be dry or low quality (as in, made by my dad or brother who like theirs the consistency of shoe leather).
If I get cheapo steak on cheapo steak night at the biker bar, yes, I do.
If it’s quality steak from a quality restaurant, then no.
I live in Ohio.
I can think of a resturant or two that might bar you for life if you asked for ketchup for your steak. 
I’ve never done it and never seen it done. A1 sauce maybe, but never ketchup.
Raised in upstate NY
Ontario, Canada.
Ketchup with STEAK? Gosh, no.
Raised in Texas, currently live in Seattle - absolutely no ketchup on steak. I don’t think I’m pretentious, those are just 2 tastes that don’t go together for me. As a note, I also dislike barbeque sauce on meat.
My shop in the dining hall where I work during the year sells a lot of steak. We do not even keep ketchup in the shop. If a customer wants it (I’ve seen this happen once in the almost 500 hours I’ve worked there) we have to tell them to go over to the burger shop for it.
Sadly, the one person I’ve seen ask for ketchup is my little brother, who was visiting me at the time.
No one else in my family does it. I don’t know where he got it from.
Ketchup is Satan’s smegma and I haven’t eaten it on anything since I was a kid. A good steak should consist IMO of steak, salt, pepper, and a minimal application of extremely high heat (excepting as noted above chicken fried steak, which is consumed fried with country gravy).
Southern California.
Montana. Beef country. Grow my own.
A really good steak: no adornment whatsoever.
A mediocre steak: a good barbecue sauce.
Chicken-fried steak: Good country gravy with fresh ground black peppercorns.
A poor-quality steak: I’ll make chili out of it. Really hot chili.
Top-quality hamburger: a good barbecue sauce.
Typical hamburger: Yep. ketchup.
side question, if I may. Several posters have commented on “chicken-fried steak”. What the heck is that? 
Basically, it’s a piece of steak prepared like southern fried chicken: battered and fried and served with gravy.