Less than the price of the 1.5 drinks I've probably had in that hour. If I'm playing $10/hand x 60 hands/hour thats $600 per hour gambled at an expected loss of $3 or less. I can stay at an awesome resort like Bellagio/Wynn/Cosmopolitan for way cheaper than a comparable room in any other city because the rates are subsidized by their casino earnings, and then if I feel like it I can go downstairs and play Blackjack with a ~0.5% or less house advantage, which after the comped drinks, the experience of playing on their awesome casino floors, the people watching, the venue to hang out with friends, is another win.
I don't really believe in 'gambling' but I love playing blackjack in Vegas because if you just play perfect basic strategy its a very cheap form of entertainment.
