Well the reason I have a few extra copies is that I would usually buy one copy for myself to play, then at some point I'd see one for a great price on Yahoo Auction Japan and pick it up figuring I could trade it for some other rare/sought after game I wanted.
As for SoTN, I do like the PS1 version better but you can play Maria in the Saturn version for what that's worth. But the reason I bought three copies (used to have four) is that I had bought one at some game shop in Japan that was in terrible condition but playable, then I picked up a copy in better shape on YAJ. Then some crappy seller on YAJ posted a "new" copy of the game, which I took to mean sealed. I usually don't collect sealed copies but I wouldn't mind a sealed SoTN as I love the series. Bought it for a fairly high price it arrived opened and used (even a few light scratches on the disc). The forth copy was one that was so cheap I couldn't pass it up. Keep in mind, this is coming from a guy who had five copies of Drac X at one point, so take it as you will.
Also, here's a few PCE titles I have on hand. Grabbed the wrong box out of storage so a lot of my more rare titles are still there somewhere!
