It must be a very boring life to purposefully work with uninteresting technologies. It may sound selfish, but I'd never make that decision. When I'm interested in what I'm working on, I build a better product. I'll sacrifice a few 9's any day to enjoy my job and make something that's interesting.
My excitement for the tools I use is directly proportional to the excitement I have for a product.
For example: over the past 4 years, I've all but abandoned all of my PHP projects in favor of my Rails projects. Because Rails is far more interesting to me than PHP. Just a small example, but it goes all the way down the chain.
I think it's probably a pretty sane life, to be honest. There's always some technology that's more interesting than what I'm currently using. The times I'm most productive are the times I haven't worried so much about that and worried more about how efficiently I'm spending my time.
