I like Rhumbar, tasty drinks, nice waitstaff, good music and a phenomenal location...unfortunately I won't go back.  They have started charging a 3.75% CSF, a fee for no reason other than to make more money.  Our waitress told us it was called a Concession Service Fee, and that it was a way for them to make more money without raising their drink prices.  This fee is ridiculous!  The CSF wasn't even listed on our menu, it just showed up on our final bill. Charge me what the drink cost and don't tack on a fee at the end.  I'm more than willing to pay the current cost of the drink and would even pay a dollar more, their prices are competitive with other speciality bars on the strip.  In all fairness, we did a little investigating and after looking through a couple of menus we found one with the fee list, also our fee was waived when we asked to speak with the manager (he never talked to us just told the waitress to take it off the bill).  I would love to go back to Rhumbar but until they get rid of the fee I won't be back.  Lesson for anybody that does choose to go to Rhumbar, asked to speak with a manager about the CSF and they will waive it rather than have to justify their shoddy business practices to you.