For most people, the fact that they say something would constitute evidence that they believe it. But for some reason, people persist in claiming that Rush Limbaugh and Ann Coulter, alone of all pundits, commentators, and others on the political scene, are utterly faking everything they espouse for the sole purpose of getting rich. I have yet to hear any commentator on the left accused of "just saying that to make money".
I'm typically skeptical, but that comes from my dealings with people in regards to religion. A whole lot of people claim to be Christian, promote Christian beliefs publically, but privately are anything but. I'm a big believer in that whole "Faith without works...." dogma from the Bible. If you really believe, put some skin in the game.
And this is most certainly not limited to the Right by any stretch of the imagination. I'd put forward that the Right makes it easier to get rich espousing the correct dogma thanks to imprints that specialize in publishing strictly Conservative slanted books, book clubs that buy up said books like hotcakes, and the advent of Right Wing Radio. The fact you can see attack pieces on a leftwing celebrity in Walmart and Target within about 15 minutes of them getting any level of fame seems pretty clear evidence of how well that machine works. But there are most certainly folks on the Left who are completely in it for the money. Think about Global Warming for a few seconds, and I'd bet you'd agree.
So long story short: Lots of people publically espouse beliefs they don't care to shakes about for money. It's just that you'll probably make more money, and get more famous, if you're on the Right. The Left just isn't that organized.