I do like to know if at provider can in fact cum.

For some of us, seeing at lovely T-girl cum is extremely HOT! It gives the impression that you are into  the session (even if it very well may be just an illusion) and...well, like I said, it's a turn on!

Now, as realistic customer, I don't know if I've ever asked any of those questions on the phone because just like the OP, I'm sure I'd get one of the ambiguous answers he listed.  I just pick providers that I know can cum based on reviews and go in hoping that if I do my job, and the provider didn't just blow her load 30 minutes earlier, that I might get lucky. I always know it's YMMV too.

I do find it interesting that your batting percentage (so to speak) is 1000%. If someone is interested in you, is hoping you can spin a plate on your stick, and you can, why wouldn't they see you?