I found, on TER, what appears to be a nice, well reviewed provider with a number of them from guys with a lot of reviews, for outcall. However, she says on her website that the "donation" should be out in the open...no card, no envelope. Is this a red flag for anyone?

Whats the difference if she picks up an envelope off the counter or a pile of cash, either way she is simply taking her renumeration for her time.  Nothing else.  In fact, who said it was there for her, amybe she is taking it for a friend...LOL.

If it is a bust, they don't care if it is in an envelope, on the counter, or in your wallet, they are busting you anyway.

Find good reliable ladies and live by their rules.  This is their livelyhood, they usually know what they are doing if they are good.

If she is a well reviewed provider then I would not worry about it. They all have different ways of handling the money, I would question it in my mind, but WTF.

My favorite UTR lady asks that the money be placed in the open and NOT in an envelope. She has her reasons, among them being the guy who tried to pay her in monopoly money...

she would never tell anyone about that...LOL.

A guy who tries to pay someone with play money has obviously lost a few brain cells. Cheap isn't the work for this guy...

I've never put the money in an envelope.  I have nothing against it in theory.  More likely is that I can't remember to grab one.  It has never been an issue, except that I forgot to pay a lady one time until after we'd left the room.  Since we know each other well enough, we joked about it and went on with life.  They're working for the money, not the package it comes in.

I find my brain tends to forget details when it knows it's about to get laid.

Sexus Brainus Diminitious I believe is the technical term.  Or in lay-terms pussy on the brain.