Hey, could you please thumbs up my answer if you thought it was helpful. I'm trying to earn points for a vacation (kidding).
I'm planning on taking the appraisal course, mostly because i know i'll be making a little more than i do now, completing Broker Price Opinions (BPOs). Some can be a piece of cake, while others will have you pulling out your hair. Its a nice paycheck regardless, and i don't complain.
So to summarize: don't quit your day job. Appraisal work should supplement your income and not be your only source. I don't know of many appraisers these days earning more than $100,000. I'm sure there are some, but i'm willing to bet the majority are lucky to clear $50,000.
You may want to consider becoming an agent while you're at it. Make money working the distressed sales side of the business, with appraisal work on the side.