On the recharge event.
Recharge 50 is a win-win recharge.
Recharge 300 (You could have make it 250 so its easier for us rather than do 250+50 recharge) again, win-win for me.
Recharge 2000 a day is tricky, 17 frags of Susano Sasuke in total, what can I do with it? Are u going to release 800 ingot per Susano Sasuke frag like you did on Ay which was totally overpriced, or are u gonna release him more in future events, because we cannot do anything with 17 frags. I would be very tempted if its a 20 frag, that means 60 more frag or 80 more frags for 4* Susasuke. Elsewhere, I value adv refine at 30% disc from sage key which is 26 per adv refine, thus 260 worth of coups. Again, like I said, 17 Susasuke frags worth nothing right now and all I can see is 260 worth of coups from 2k recharge. Making it to 20 frags will help in my decision making.
But right now I am only looking at 300 ingot per day recharge, even that, the keys are in a very steep diminishing return for me, I am more interested in charms, adv refines, pills or adv threads right now.