time is at least as much a factor
heck, the money you make from a job means that you spend time at that job,... so of course you have less of that to dedicate to certain games over others
among other reasons that vary between people of course
everyone has to actually pick out which games to play and which ones not to bother with
one person might really just like the occasional point and click, while someone else prefers RPG's, just to use a really broad, generalized example