A good post on motivation and entrepreneurship: On Having Balls Part 2: Staying Hungry.
And that is the natural, first-instinct way to address the problem. "Well, maybe we can pay them more to make them happy."
It never works. At least not here in Silicon Valley. Engineers at HOTorNOT last year were making 2-3x normal salaries, yet they were not happy... and we really couldn't expect them to be. After all, the only people we trusted with our baby were people like us.. and god knows I wouldn't have stayed here for a high salary. At their age (23), I wanted risk and potential reward, not a steady job. I make a big deal of telling people that when I finished my MBA at 25, I turned down a job that was gonna pay me about $180k in the first year.. despite the fact that I was $50k in debt.. to instead earn no paycheck and give entrepreneurship a go. These are the type of people you trust to continue running your site in "high profit margin" mode. Big company types won't do.