I have been curious, and now I am pretty sure. Since I realized they have life skill crystals (lul,) I can now gather at 2k and I can say there isn't much difference between say, 1750 and 2k. There seems to be an energy use difference, but that amount of mats is not wildly different, which is CRAZY.
I think it's crazy how many rolls you'll get of like x10 and such on minigame so you end up with x100 for 10 energy. This isn't going to solve the discrepancy between gains, but I was reading someone talk about the minigame, and I agree it needs to change.
I would like to see a change where you can skill into a lower energy use (5, 7, it all adds up) or skill into a 50/33% chance of not using energy. Not sure how this would work for every minigame, but there has to be a way. I'd also like to see you be able to roll a no energy use minigame randomly using the same mechanics that it does for free gathers. I'm pretty sure you can't.
But there are def some issues: the difference between +150 or +250 (scroll) life skill at the top end and the fact that the minigame can really crap on you unless you end up getting 10x a good item.