Considering how much profit you make when people buy others emeralds and from the reset, doesn't 20% of the emerald going back to the owner when resetting sound better?
The entire server profit
before the refund is *roughly* 50% of what the last user paid.
The refund is 40% of the server profit.
40% of 50% is effectively
20% of what the last user paid...
EDIT: I'll change the site if you want, to make it a bit clearer, as that is the current refund given