I know that possible buyouts have been talked about quite a lot here and there, and I know that the answer to if someone would do it is "well it all depends". Yes, we all have our price, and it most definitely depends on the image.
All that said, I am looking to contact a country club/golf course in regards to a photo that I took last summer. I happen to live in an apartment complex that's right off the green on the 18th hole... and I took the photo one morning before work, around 5.30am.
Here's the photo (4-shot panorama):
The original file is 8116 x 2309, which would lend itself to a pretty sizable print. I can see a number of applications that the image could be used for, and hopefully, they'll want at least a print of it.
Basically what I'm wondering is, if this was your photo, and the people you contacted regarding it wanted to buy all rights to it, what would you release it for?