And how would you do it? Analyse each account separately? With the number of clients they have it would take days if not weeks.
Put a hold on withdrawals for accounts that have splits/merges AND more than two boosts in a 24 hour period. Give yourself time to investigate it and then take boost payments away from those if proven that they cheated the system. There are ways to do it, and it doesn't take days or weeks unless it's all stored on punch cards.