I'm being facetious and exaggerating a bit, sure. But for every engineer doing cool machine learning stuff, there are 10 mucking about with AdWords and AdSense

I'm being facetious and exaggerating a bit, sure. But for every engineer doing cool machine learning stuff, there are 10 mucking about with AdWords and AdSense front-ends -- on customer-facing stuff that they probably don't use themselves. It's energising to work on a product you use, it's draining to work on one you don't. (And I guess I'm putting words into the mouth of the earlier poster, sorry about that. This is from my own experience, not theirs!)