Yes, but truly great guitarist aren't in it for just the money. It's the playing.
And all those guys you mentioned are doing very well financialy I assume. I know Malmseen is. He has sold triple platinum albums in Japan and The UK. Do you realize how much money that is?(his share) That guy is filthy rich. And he sell out stadiums in most parts of the world. Yep, Speed and showmanship is good for something, if you know how to use it. It can draw a overseas crowds like flies to s***.