The answer to why your employer isn't paying your "worth" is because there's no such thing (or at least it's incredibly hard to measure). There's no real price discovery happening (and even in markets where there is discovery prices can fluctuate wildly).

Here's one interpretation: People are willing to get paid less if there's something else that can make up for that fact. I wasn't looking to trade something else for money which is why the "deal" of offering me more money didn't work. I see it as more about culture.

But then again, if I look back, the things that I am looking for have also changed. So sometimes "It's not you it's me" :-) is really true. I used to work for a great company for a long while and I'd still be very happily working there if they hadn't been acquired and flushed down the toilet (culture + business broken). In a sense selling the company is the most selfish act a company can perform vs. its employees. Otherwise I might have been making a little less money, producing a little more value and a little happier. Our economy sucks at optimizing these things.