I'm new to punting this year. I think a lot of this comes down to what you want. For me, top of the agenda is looking for someone I can have a really good time with. I'm a one-time popper as well and for me top of the agenda is a really good GFE. I look for a damm good snog, a good bit of foreplay and a girl that likes to receive as well as give. I like someone that greets me with a smile and I have found in my limited 11 months experience, approx 25 punts, that I can only get that from someone with good reviews, 60 mins and can converse well in English.
In the few 30 min punts I've had I find they just expect you to get in, pop, and get out. On a few occasions I've just gone out looking for a quick shag and hoping for a good blowjob but for the most part I want to have a good GFE, so I expect to pay 160-200 for a memorable 60 mins.
When I arrive I go in with the mindset that I am in for 30 mins, but within that first 60 secs I decide whether to go for an hour or not.
I'd say that in the vast majority of cases, you get what you pay for.