PS1: 2 copies of FF7 (normal and Platinum), Abe's Exoddus (English and Italian), Judge Dredd (mistake, they were free so whatever) PS2: None, only different, updated versions of same games (MGS2, MGS3, Virtua Fighter 4, etc.) PS3: Time Crisis 4 (EU and US copy, the latter came with the GCon3 bundle)
PS2 MGS2 Substance, bought one because I wanted the extra features, both copies were defective. Eternal Ring, bought another copy because the one I originally had stopped working. Summoner, I've owned two different copies of it, sold one years ago then decided I wanted it back and bought another one. SOCOM 2, bought all three PS2 titles at Gamestop for less than $3 each even though I already owned a copy of it. Max Payne 2, bought one copy, it suddenly stopped working so I bought another one. Oni, I own both the PS2 and PC versions.
PS3/360 Call of Duty 3, I have an almost non-working PS2 version, bought the PS3 version so I could finish it. Batman Arkham Asylum, bought the vanilla version for myself, bought the GOTY edition for a friend who stopped being my friend before I gave it to them so I kept it. GTA4, bought it on 360 originally because that was all I had, when I got my PS3 and decided it would be my console of choice I bought it for that. Resident Evil 5, same thing as GTA4. Heavy Rain, bought the vanilla version, got the directors cut as a birthday gift. Fallout New Vegas, bought the vanilla version, then the ultimate edition when it came out. The Godfather The Game, bought it on PS2, then bought The Dons Edition for PS3. Red Dead Redemption, originally started with the disc version of Undead Nightmare because I wanted a zombie game to have fun with, then bought the regular RDR disc, then bought the GOTY edition when it came out.
I am a dedicated member of the "Walter Sullivan Is Bad-Ass" group!!! I am the true originator of the Cookie Demon theory on the SH2 and 3 boards.