To be fair, a list of memorable games by club over its history will not change much from one year to the next, but there are many other games which could be shown, as many have said, given the rich library at Fox's disposal.
To answer another question posed, why not show more games? Umm because it's easier not to....?
With that said, a mate of mine used to work at Fox Sports, in the 2012/13 off-season, he got in touch to ask if I could remember notable games for each club. So at least in that off-season, there was some work done on finding new classic games to show.
I also once asked him why they never show games from 1997 Super League season. He didn't have an answer, except to say the tapes existed. There's some games from that season I, and I'm sure many others here, would be interested in seeing again. No doubt there's a tonne more (one comes to mind as a Tigers supporter, the 2005 semi-final v. Brisbane - I can't recall this ever being replayed as a classic game).