Donut exchange rates all over the place in Springfield Heights

It makes sense to me, it's "more work" to do all characters individually, just like in Tap Ball it was as well. Where the "buy it now" price you just tap it and done. In reference to Tap Ball, I think you were buying a pack of them - and this varied based on how far/close you were in terms of tickets. Technically it was "free" if you waited out the tickets.