Let the extortionists stew. They're just wide boys trying it on.
Eventually those who depend on the extra cash will realise that there's no longer any shortage of competition out there, and more SPs are joining the ranks all the time to undercut them. Some business at a reasonable price brings in more cash that ZERO business at £200/hr.
Keep giving the reasonably priced your business, and don't draw attention to the overpriced.
And certainly don't give them your business, it only encourages them to become even more expensive.
We drive the extortion by paying what they're asking for.