 I don't understand what does this sentence mean?
"the reason I'm asking is because if the money is good doing what you're doing---"So, what does it means " if the money is good doing what you're doing"?

It's not a complete sentence. Anyway:

"The reason I'm asking is because.." = I'm asking this question for the following reason:
And then the reason is given. "If the money is good.....".
This sentence is incomplete though.