I assume that providers use the 2-call system to guard against potential LEs by not giving them time to stake-out a sting and also give the provider a chance to scope-out the client.

So, my question to all you lovely providers out there...

Would you be insulted / turned-off if a client tried to use the 2-call system on you for an outcall?

I wouldn't be insulted though I would NOT do it.
The closest I have accepted is not knowing a room number at a hotel until a call just as I arrive.  Then again since I like to meet in the lounge the room number is moot.

A ladies 2-call system is about LE's sure, though also personal security.  If I even consider meeting you at your house, your address is part of my screening.

So, ah, turned-off?
Yes.

When I hit my hotel I always call and give my regular the room number. She doesn't mind AAMOF She has asked me to leave her a key at the concierge so she doesn't have to wait in the hall just.02

I wouldn't be offended but I wouldn't take take call either. When I first started the Biz, It took one time to take the clients word for it. that this as his hotel or address. Once there either no one answered the phone or he didn't live at that address.

   So to solve this problem, the name and room #/address given at the beginning of the call has to match when I call the Hotel or 1411 (Info). Other wise I don't go to the call.