Few people are successfull and living their dreams, while the rest has no choice but being sarcastic and cynical to prevent them from becoming suicidal 
So you're assuming that people with money are successful by default. This, my friend is a wrong assumption, since there are plenty of rich people who are depressive as fuck (RIP Robin Williams and the list goes on)
So successful people never make sarcastic jokes? Well, maybe in your boring country

Not sure why you start about cynical?
I guess you're just a biased and limited thinking person. I would suggest that you travel a little more.