Yeah, a couple of times in the very, very distant past I've had a covered blowjob for a tenner. Mainly because I used to walk through / live in one of the areas, kept getting propositioned, and curiosity got the better of me. It felt really, really sordid and nasty though, and speaking to the women afterwards most of them are in pretty dire circumstances. Certainly something I would never repeat.
Comparing that sort of punting to a nice multi-hour GFE/PSE session with an escort is like comparing enjoying a glass of Chateau Lafite enjoyed over dinner with a bottle of meths wrapped in brown paper, swigged on a park bench.