Than it is to try and pay for sex in a strip club. There is no "decent" price, it's whatever the club and the dancer charges and that is different everywhere.  

I like clubs but I don't go in looking for sex. An escort is a much better deal.

Several things to say here in order to answer you questions.
This applies to my part of the country Atlanta.
I'll go with the 2nd question first. There are no signs like the one you mention. However, legally there is to be no contact between you and the dancer in a sexual way. Whether in a VIP room or table dances/lap dances out on the floor. (yeah right!) Your not supposed to pull it out and do it yourself either. So it's a real crap shoot whether you will have an orgasm. If you ask the dancer what she will do in the VIP room the answers will be all over the place depending on how much money she thinks she can get from you. The range will be from "I won't do anything in there that I don't do out here." to "I'll fuck you 'til you can't walk." She may tell you what she will do and how much it will cost "extra" above her normal VIP room rate. The more she will do the more it will cost. There is a great chance she will tell you she will do something and after she has your money she won't and you can't complain because your not supposed to do that stuff. There is also a chance she may get you thrown out for asking about sex or blow jobs etc. Maybe not. Then you could get lucky and find that dancer that will fuck you 'til you can't walk but the chances are slim. If she will do something with you and you get caught (even if you get caught jerking off) depending on who catches you, you could be tossed out. The girl could get fired. There is also a possibility nothing will happen if you get caught. See what I mean by it's a crap shoot.
I have had intercourse in a VIP room of a strip club and I've done some DATY and I've had a BBBJ and a HJ. But only after I was a well established customer. I knew who to ask. I never paid more than the normal rate for this. If you really want to have sex you're much better off finding a provider here on TER. I don't go to strip clubs now except for a drink and some visual fun from time to time. I stopped that when I found an escort agency and TER. You know you will have sex and you know what it will cost. Reading the reviews will make sure you get what you want.

Cost of VIP rooms
cheapest was $20 dollars for 15 minutes. The dancer got $100.
Most expensive was $35 for 15 minutes. The dancer still only got $100.
Now you may consider this cheapest when you figure cost per minute. One place was $25 for 30 minutes in the room. The dancer got $150. She wanted $50 more for a blow job.
Another was $70 for the VIP room 30 minutes the dancer got $200. (Compare to this - You can find a lot of excellent escorts for $250 to $275 and see them for an hour in a nice apartment or hotel room. Beats the hell out of a VIP room, doesn't it?
Once was in a place that wanted $65 for an hour VIP room and the dancer got $300.
Remember in any of these the dancer may ask for more if she will do something "special". But she may not follow through and actually do it.

When it comes to strip clubs you never know. Newbies in strip clubs Don't get lucky very often.

lot more fun in a much more cost-effective environment.