Telling a writer that they'll be a rich and famous writer someday is a BIT like telling someone they'll be rich someday because they buy lottery tickets.
It's not a perfect simile, of course--most famous authors have put some effort into their writing. Some put a ridiculous amount of effort in before they make it big, though some others work just as hard and never hit. (But on the other hand, if you work harder at buying more lottery tickets, you have a better chance of winning...) Most famous authors have at least some talent, but again, some of the most talented ones never make it big.
Me? I'm so honored and flattered when someone pays $2.99 to get a copy of our book and, hopefully, read it someday.
Don't tell anyone, but I'd do it for free. Though I am looking forward to that $10 in royalties from Amazon that should come through in a couple months.