Yes, at a restaurant, if the tip is already included at 15% to 20%, I do usually tip on top of that, because I generally tip a little more than 20% if the service is good.
There are places that have a structure "140 for the hour and a miniumum required tip of 60" or something like that. But I don't know what the breakdown is for spellbound. In any case, it doesn't matter. There are reasons you pay a premium for places like spellbound. It's not like an AMP with a higher price because the activities are included. The premium isn't for extra services. It's for environment. You are paying extra for..
1. American Girls, or at least girls who speak english much better than at an amp.
2. Girls that know it's supposed to be sensual, as opposed to a good massage with a mechanical hr
3. Girls that get undressed and allow at least partial touching
Shit like that. So, paying extra for all that, tipping is still, in my opinion, the correct behavior.