I'm not really a believer - if they were truly psychic they would be rich and wouldn't need my money.
I have been to a couple over the years - more for entertainment value with friends. Their info is pretty generic so we mortals tend to twist what they say into things that happen in our day-to-day lives and interpret it in the way they have subconsciously directed us. That's my feeling on them anyway. It's one way to earn a living I suppose, like selling snake oil.
Actually Yosemite many believe it's a gift and shouldn't be used for monetary gain. While others just are not that good to predict lottery tickets, etc..
I personally believe that if the Lord & Lady wished I were Rich I would be. No amount of Psychic ability is going to change their will.