But for most of us here... it doesn't account for the fact that you're working as a bartender. I don't know about everyone else, but I want to enjoy and be fulfilled by my work. When I'm building awesome software I loose track of the workday... slinging rum for 8 hours a day sounds like some terrible purgatory.
And from anecdotal evidence, I don't think there's nearly so many great income arbitrage opportunities in the high tech sector.