Well first thing is to be practical it is not possible to clear out each and every person's credit balance , because there are lot of members whose balance varies from 1 credit = 8 cents to a few credits less than 100 credits = 8 dollars.
So if the admin is deciding to pay then i guess he will set a further lower balance something like 30 or 50 credits and i guess he will pay all the members who are above it