Hrm. Maybe I could have it so that there is another window that displaies an option for manual control, or, as you suggest, an automatic "Next Level" option?
*Edit: I kinda like that solution best, actually.
*Edit2: Image updated! I have no idea how/if I can pull off displaying how much EXP players would pay when the cursor's context is on "Next Level". However, I can at least display how much players paid after choosing said option?
Geeze, it's only 10 in the morning, and I wanna go back to sleep.
*Edit3: I... might have figured it out? Probably could use MOR TESTING, though. Later. Later is good.