I used to really be into collecting games, but due to personal issues almost all of them were sold off only just a few years back. I think it is too late to start collecting again and be able to have any kind of interesting collection. For the past three years my most impressive set of games was what I owned on the Xbox 360, and it will stay that way for awhile.
What would be a more accurate site for me is something like "What have you played?" place. In which case, over 100,000, I am sure. I used to test games for a company a few years back which was actually a terrible job and I would recommend to no one. I sure got some nice insight on what not to do in the industry though!