I feel your pain and know just how you feel. We've all got games in our libraries for which they either weren't able to make a trainer or the game had to be retired for valid reasons.
But for the relatively few retired games, there's literally thousands of games that they've produced trainers for. If it's any consolation, this is what they've released since *2010:
2010: 526 trainers
2011: 803 trainers
2012: 1120 trainers
2013: 1884 trainers
2014: 2131 trainers
2015: 2050 trainers
*Totals previously posted by PWizard.
[Edited by element5, 3/21/2016 3:23:39 AM]
the other will likely be retired when they update it or put more anti cheats in it.
enjoy it while you can.