It's kind of a weird question....why would I hold back or get a hand towel to dry up my excitement?  
Sometimes it is intentional too....  
For instance, I will masturbate thinking about my upcoming session. An hour is really never enough, I enjoy getting off, so assisting myself to being one step closer to my personal hedonistic goals, is ideal.  

I would love for you to develop your question more.  
1. Should a provider not be excited?...Not -Revved up? Dry between the pussy lips? With the body temp low cuz of zero blood flow due to lack of vasodilation that is caused by arousal?  
2. Should a provider just fake having a good time?  
3. If a provider is not excited to see you (or her next session), why is she in this profession in the first place?  

If I'm not excited to see you, guarantee THIS:  
A. you will never have a chance to walk through my door.  
or  
B. you will never walk through my door a second time.  

I fuck who I want because I like the sex. And you know, the paycheck is great too.  
The question is: which gets me more wet, the cock or the money? Hmmmmm...Maybe that is the question you should be asking.  
Or which came first?  

Please expand on your question.  
Dripping with excitement and anticipation,  
Samantha SOFA KING Good