am considering a provider, well reviewed but has no website. CV add says "call for rates" but isn't discussing this topic a no no.

I'm not sure I would consider that provider anymore.  We, as a general group, go out of our way to avoid discussing that on the phone.  Even the ladies that I know that don't have sites post their donation on their ads.

Eek.

Beware of upsell. The few times I seen a provider that did not post rates there was an upsell. Always over $100 there stated rate. Note I only did this twice and it was before I found terms. I would stick with providers that post there rate and state it is all inclusive to avoid upsell.

Talking about rates is not  as off limits as many here would like to make it. Talking about specific sex act in return for money is the big no no.

When asking about rates, just remember to be discreet. Asking "how much for a blow job?" will definitely get you hung up on. lol

Something on the order of "how much is your expected donation for an hour of your time?" is a perfectly acceptable question, espcially if the is no rate information given, or if you have conflicting information about her rates, as in two different ads with different rates.

It is quite possible that the provider in question doesn't wish to "publish" her rates on a web site or ad because her rates may vary with market conditions.

I'm not talkding about upsell here.  I'm talking about how many calls she may be getting and appointments she is booking.

Thank about it.  If she goes 3 or 4 days without getting a call, and then someone calls expressing interest, she may quote a rate of X per hour.  But, if she's several calls a day and is having no trouble booking appointments, she may quote 2X per hour.  

Do you think I am making this up?  A provider I know told me that this is exactly what she does.

You can try asking if she has a site w/ the rates or ask her what is the donation for x amount of time if she doesn't have it in her rates.