To be one of them, you don’t really have to effect substantive change for the good. You only need care and feel good about it. If you can get rich while doing it and celebrate amongst your contemporaries in that aura, all the better.
And they all manage to do that, don't they?
Liberals always claim they want to be elected to do well for others but mostly they do well for themselves.
They go into congress and the senate as paupers and come out as millionaires with gold-plated retirements the rest of us can only dream about.