She was hardly 'fresh out of school', she was in the middle of doing a PhD. And yes, I do think it's sad that anyone has to make a living working as a prostitute, if that makes me some sort of Victorian prude then so be it.
"I did have another job at one point, as a computer programmer, but I kept up with my other work because it was so much more enjoyable."
It was by choice. Now what, if anything, does this say about what we do? Contrary to common arguments surrounding the topic of women in computing, this woman is definitely not averse to science / technology. She's got as much geek in her than any of the people on this site, and yet she preferred being a callgirl to a programmer.
Not easily, not at all. I know a few people in that range, they are seriously good, it took them many years to get there, and they're not paid for their C++ skills (which are taken for granted at this level) but for their domain knowledge (usually very exotic financial instruments). What they do is translate what the quants want into code.
The average IT contractor in London probably makes 30-40 GBP/hr.
The other group that has insane billing rates are (top) photo retouchers. GBP 500/hr is possible in that field.