What's the average donation/rate for 1 hour with a good quality provider whose average ratings are at about 8 or so..?

If so you could research this every lady is different just because a lady's ratings are an 8 does not mean that she will be in a specific rate range.Look for a lady that fits in your budget every lady sets her donations as she fits whether she has a 1 rating or a 10.

how much the market will bear for that area. If the ladies have reviews on here, look them up. If not here, but posted on their websites, look up those. Then do the math: add together X number of rates and divide by the number of ladies' sites you studied = "average" rate.

Now, why would you want to know the "average" anyway?

If it's to learn what most ladies ask for so that you don't feel like you got it on the cheap or so that you don't feel like you overpaid, that's actually a wise move. That way, you can plan your budget accordingly and know that you're getting your money's worth. Keep in mind that YMMV. A lady that you pay $$$ amount to might make you feel like a king; you might end up feeling that you paid too little for her company. Another lady that you pay the same $$$ might make you feel like you got nothing much for your effort, and that you paid too much. So, be aware that one man's 8 could be your 9 or 7.

If, OTOH, you want to know the average because you intend to negotiate, don't waste their time. If they have a posted rate, it's their rate. If they have a sale going on, then go for the sale. If they offer a one-time discount to you after you've seen them, then take advantage of it. But, don't try to negotiate.

Have fun out there and be safe!

Very much so it depends upon where you are.  And often her age, her looks, and probably more than any of those, her reputation. Reputation may be a result of reviews, notoriety as a model or film actress, or participation on here.  It also varies with her marketing approach to the business.  Is she a scarce commodity (an Hispanic lady in Minnesota).  Are you in an area that is highly seasonal, such as Washington DC or a big convention city?  Many variables.

Why even ask? Hobby at a $ amount that is comfortable for you.  All the other posts are valid as well.

than say a smaller mid-western town (Indianapolis, St. Louis, etc.).  Smart hobbyists stay within their discretionary budget and do not use rent, car payment, utilities, money to p4p.