One of the longest-running 'non sexual escort agency' scams aimed at men, Cavendish Knights, charges ?17.75 for a 'security check'. It's not much, but it all adds up, especially when you have thousands of victims.
I'm particularly pleased at having worked out that, because of how they handle things, they're either illegally evading VAT (unlikely) or must have less than one job per 'escort' every five years or so (highly likely, given the real level of demand).
They're also known as siguk.co.uk he says to catch anyone searching for that.