Forgot to mention in my previous post: I've never run a ticket website before so I'm not sure how it will perform. Just wanted to get that out there before a bunch of people go running to start ticket sites
The idea behind it should work for almost any niche that has a lot of different "items". For example: baseball cards, records, movies, songs, and so on
ad infinitum.
I picked tickets because I had an old domain in my account that I meant to develop. Not TicketDepot.org, that's only 1 day old. The other one is a .info, and I'm not a fan of .info's for PPC sites or "real" sites, so I bought this one. I think I'll use the other "ticket" domain for airline / travel type tickets. Planes, trains and cruises, that sort of thing.
Also meant to add, here's the link for eBay's API stuff:
eBay Developers Program
Lot's of good shit in there. And unlike some API programs, theirs is completely free, unless you want to become a 'Certified Solutions Provider', then you'll pay $3000 per year. So, unless you want to develop apps to sell, don't worry about that.