Respect for his dedication (and it musta cost a packet). Waste of space tho, if you ask me. I bet he's never played on 90% of them.
I wouldn't say he's a tester, I used to do that for mag reviews in ye olde GameBoy & Snes days, and you hardly get to keep any, and mostly get a cart or CD in a jiffy bag, no boxes or instructions etc.
Could prolly get all that room full, on a few dvds or a hard drive emulated on ya PC (like what I got).