There is no upside to what you are talking about, and nothing but downside.

...gotta keep'em separated. Your two worlds that is. One is your real life that I'm sure you don't want to mess with. One is a fantasy.

I suggest you not have just one you see over and over again. It's great to have favorites but have several and rotate seeing them. You'll find that they can each be a favorite for different reasons and you will see them based on which one you feel like being around at that time.

What she is doing is good customer service and customer relations. Keeping in touch keeps you coming back. It's always important to remember it's a business. They are good at it.

but now and then I get entangled with someone who is, let's say, needy and clingy.  It's hard to resist sometimes, but resist we must, lest our bank accounts and mental stability both get reduced to zero.

Nothing worthwhile is effortless.

but when the door closes between you...  you are strangers.  

I have a Favorite lady...  When we get together for an hour of play, we spend much more together.  We chat, make lunch of the fixings I brought...  until it's time for me to go.   I am fond of her but know in my heart if I was suddenly single again...  it would never work.  

I just enjoy the time when we are together.  In between, I make sure to see others...  It is necessary to balance out those post-coital hormones.

Damn, that pussy is some powerful shit. Thought I knew that.