Take your average 20 something year old hot shot highly sought after programmer, well I make 3 times as much as him. As soon as that little tidbit of information is out of the bag, I'm suddenly "too old" or would not be "good cultural fit" for the budding startup.
Sad thing is, it's true. Most of the companies these days are not really solving hard core problems any more and don't really need someone of my level of expertise and skills (how many are in the guts of an OS, databasse or compiler, or need their server performance insanely tight). Most are hoping to disrupt Facebook or Twitter, and for that "social" stuff kids who don't know what they are worth are better suited anyway.