Depending on the attendant some don't like working the hour session. Potential money loss. Two customers in an hour makes more money than the one hour customer.
Dumped a regular because of that. I wanted an hour so I could just relax and enjoy. Instead she became mean and complained that half hour is good enough. I walked. Never saw her again.
Advice to the newbies: don't fall in love. She just wants as much cash as possible. Learn to walk away. Move around, explore. You never know what you might find.