I agree about 90%. Sometimes though, it pays to learn the weird or new stuff. Sometimes, you can make a lot of money knowing the next big thing, even if it goes away in a year. You have to be well positioned though, like being an hourly contractor.

I'm generally the guy who knows the boring shit. C, networking, 'Linux', hardware, RF... But I keep telling myself I'm going to jump on the next bandwagon just to see how the ride goes.