How many times have you replayed a game, even if its only half way then quit. How many games have you done that for? Even though its awesome, think of how many new games you still havnt played. Like i want to play Killer 7 again but with so many games out there should i bother right away? probably not.
Oh and this doesnt count endless games such as Fighters (smash bros) or MMORPG (world of warcraft) or even FPS’s ( Counterstrike,COD,URT).

Me
FF7 - 2times
Chrono Trigger - 2 times
half life 2 - about 2 times
Deus Ex - 2 times
Final Fantasy tactics - 2 1/2 times
Contra - 3times
Megaman 2 - 4 times

...

Half Life - beat it two and a half times. once in about 2 days(my first time) the second time I managed in 8 hours and then I played half life halfway through while in my IT class back in highschool. The computers were so unsecure in my school, I was able to install a pirated copy of half-life on my school drive.

HL: blue shift - also beat it twice.

Deus-Ex - beat it twice… on 2 different difficulties… actually I think it’s time to replay it.

CoD/CoD allied assault: beat both games twice: in medium and then in veteran difficulty.

I want to replay HL2 before I start with all the new episodes.... bioshock is also a good candidate for replaying and so is HL: opposing force.

then future games that look good for singleplayer: Far Cry 2, dead space, the new crysis.

I’ve also been having an itch to replay through Bioshock, especially since the just relased a teaser trailer for the second one.

System Shock 2
Deus Ex
Half-Life 2

I can see myself going through Dead Space again.  No interest in returning to BioShock.