I feel like an idiot admitting to this... but I have spent THOUSANDS of dollars (under $10k though) over the last 3-4 years buying sites and domains, paying for them, and just forgetting about them or being too lazy to transfer them and host them myself. I remember buying some type of Family Guy aff download site a few months ago on SitePoint, transferring the domain, but I'm pretty sure it still points to the guy's page, and he's still making a few hundred bucks a month off of it.
In fact, I have a list of domains that have still yet to be transferred to me because they are at different resellers or registrars and I've been too busy with other shit to even care.
NamePros hates me now because I bid on like 15 domains, paid for all of the big ones, transferred one or two of them, and forgot about the rest. The owner had to get in touch with me because I never got an email telling me I won the auctions, and although I still want to make good on it, that was weeks ago, and I'm sure they all think I'm some small time delinquient domain buyer, heh. I feel bad, and I totally would pay for it all, but to be honest, my time is so fucking limited, I can't take care of simple tasks like that.
So overall, I totally understand how these buyers who forget about shit they buy feel, or why they forget. It's completely retarded on our end, and I know most of you don't get it, but when you have say 30 things to do in a certain amount of time, you tend to take care of the things that are more important to you and your business, instead of the "well it seemed like a good idea at the time" type of deals.
Try to get in contact with him. If you can't refund him half of it as a show of good faith. If you have his paypal addy and he doesn't accept the half refund, then just keep it and consider yourself lucky that you got the threads you wanted and got to keep your money tree too.
:2twocents: