Why do people post their potentially awesome deals?

For the sake of light hearted conversation I wanted to bring this up.

Why do people always share ads they've seen for boats that they are considering buying or their friend is looking at. If your unsure whether it is a good deal or not it probably isn't and if it is a great deal I wouldn't be telling anyone else about it. Maybe I'm just a selfish person but if I was to come across a bargain and really tempted to buy a particular boat the last thing I would do is share this opportunity with the entire internet. Am I the only one that would shamelessly call up the seller myself and beat them to it if it was a great deal?

Don't get me wrong as I always enjoy these threads and would gladly shoot the crap about any boat for sale and spend all day considering it's merits and the market and what else is out there. We are all sitting around work reading this forum for the very reason that we enjoy talking boats and offering our opinions because our wives certainly have no interest in hearing us talk about it. I've always just thought it was kind of funny.