Since your ads are mainly focusing on attracting traders, then the gambling board isn't a perfect board.
There is an another side of the coin. These gamblers might wish to use bestchange as a bridge to withdraw winning into fiat money. If they win a lot (with help from tips and posts from gamblers from gambling board), then the probability they wish to withdraw and enjoy IRL what they achieved is higher. Than bestchange is the best intermediary between crypto and fiat as they offer variety of ways to make an exchange.
In this situation, maybe it will be better to limit the amount posts counter in megathreads towards weekly minimum required?