I think it is safe to say that Rush is not a normal person. He seems to have something to prove to himself. "Look at meee! I am richer than God and control the Excellence in Broadcasting Network! I flunked out of college and millions listen to my opinions!"
It is the same drive that causes guys like Rev Wright and Pat Robertson to build huge mansions and mega churches.
And if anyone criticizes you for being a shameless show-off, you can say that they are just jealous.