The cure for high prices is high prices. Now that everybody and her sister found out they can charge $400 the number of providers will be increased by new players hoping they could charge the same. At the same time very few new subs will join the scene because at this price they will have doubts whether it is worth it. Overtime you will have more mistresses chasing fewer subs.

In the mean time probably seeing a new mistress is not a good idea.