Yes I ask myself that for years why they don't come up with a good reward system..
I reckon the reason is exactly as you said..pure arrogance
Its really interesting, right now I don't know what they could do that woud work. GG have more 'easy play' games, such as their spins and batte royal, that have variation and seem to attract the casual player and keep them there. Then they play other games too and keep the games softer.
We've seem it here on the forum, so mnay more players are talking about trying to beat spins, or playing battle royal like its a real game. Not saying there isn't validity to it, I have considered the same too, but it shows that poker is changing, players want easy access and then feel that if they can start winning then maybe they are good.
Its like the opposite of previously when you'd see a lot of forum posts suggesting that longer blinds show a better standard of player, whereas for me this just showed some players had more patience.
Things that are great on GG for me, the best is not being able to have an external HUD, I think it create a much fairer playing environment for all players