GP seems to live in a small European city with a pretty small market for this stuff. I seriously doubt there are any Zurich-based escorts earning $1200 hour.

In London anything between 200 and 1000GBP per hour is completely ordinary, there will not even necessarily be a strong correlation between pricing and the quality of service. It is not super unusual to see people charging more than 1000GBP/h either.

There's a huge discovery problem in the prostitution market, it's really hard for a customer to differentiate between providers without actually visiting them. In many places it's hard to find useful reviews, so you're stuck choosing a provider based on heavily photoshopped photos and hoping for the best. Charging more is probably a good strategy to differentiate yourself.