there is people in gc that don't try, but theres also people even in T1 that don't try (the whole NRG situation last year). this is a not a GC problem or why GC isnt good yet. most of them are, in fact, trying
if you lose, you learn what were your mistakes. if you win, you learn almost nothing, but then you beat them and go to the team that cares. like i said, most are trying. and that's why SRG went to challengers in the first place. every split there's GC teams trying for T2 and more and more we'il see players (of course the better ones) go to T2, then T1. progress is going slowly but it's happening