As a rule I will just move on when I see a rate for GFE vs Non-GFE.  Other than that I have yet to be all that confused by anything I can recall seeing posted by a provider in the past.

When I see it I click off the ad.  I have unfortunately been caught in situations in the past when I was told that I either misunderstood what what the donation was or I misunderstood the level of service for a particular asking donation.  This is why I have become suspicious.  It can't be and shouldn't be that complicated unless someone is trying to pull the wool over our eyes.

rates on the order of the following:

one hour:   $250
90 minutes: $350
two hours:  $500

So the first thirty minutes after the first hour is just $100 (Which is fine and makes sense.), but the thirty minutes after that cost $150.

Instead of getting cheaper for a longer time, it cost more.

I might as well book two back to back 90 minute sessions for $700.

But some of them sure know how to fuck.

As far as knowing what to expect well, sorry but it's always going to be a bit of a roll of the dice.  The hobby existed way before the internet did. We can read reviews and decide if a girl might be worth investing money and time with but we are never going to know exactly what's going to happen until it happens.  Personally I'm OK with that but I do have a cut-off as far as how much I will invest to find out.

There are plenty of examples but I do not want to flame anybody.  Rates are not rocket science.  Unless we want to get back into a discussion about what is GFE, PSE, etc.  Maybe I am old school.  I want to know what I can expect before I get into the provider's room.