Hi there! You should never feel obligated to tip an independent provider. As a business owner we set the price that puts a smile on our face. If you truly feel that the experience knocked your socks off and you want to show your appreciation feel free to tip but better than that you could write a glowing review or book a second appointment. No one looks down on you and says "that bastard didn't tip me" It is not like our livelihood depends on tips like the valet  who parks your car or the server at a restaurant. The agreed on fee is plenty.  
Now, as a Vegas local you can probably expect local ladies to run specials for locals. I try to run a local special for locals once a month or give a slight discount to locals who repeat with me. You know how it is in Vegas. Locals get special deals at restaurants and nightclubs and such.  
As far as gifts. Oh that is so sweet when a gentleman has such impeccable manners that he doesn't like to show up empty handed. It is very endearing but still never expected or required.  
I don't want anyone to think that if they bring a gift or a tip that they will get better service. Everyone gets the best service possible either way.  
Take care!

Thanks Heather, very insightful.

And thanks for the Link HandleWithCare. I searched for it last month. But didn't want to post anything until I was a VIP. Didn't notice some beat me to the punch lol.

win-win.  As a child, I always loved Christmas because of the presents I was about to open for myself.   Then at some point, I began to appreciate giving more than receiving.

In this hobby, I know gifts are not required, requested, or expected.  And, as noted, they are not intended to get better service.   That is never my intention.  We all pay plenty for our hobby, so a few bucks more to make us both happy is not a big deal to me.

I always bring a gift for my ATF and try to make it something unique for her.   On our first date, she brought to the hotel a small pair of speakers and wires that plugged into her phone.  That was nice and thoughtful of her.  So on our next date, I gave her a Bose wireless soundLink.   Then, one time, I gave her a really nice Aveda hair brush for her wonderful long, thick, sexy hair.   Lotions are nice too.  Money and gift cards are good, but as they say--it's the thought that counts.  And sometimes it's not easy to come up with something unique for the gal.  I once even brought some unique food that I knew she liked.

But, plan on giving my ATF a gift on our next date.