As Frank Kern says (paraphrased),
The Money is not in the List or Spammers would be kings
The Money is not in the relationship to the list, having lots of friends is great but not a money maker.
The Money is in,... The value that you deliver to the list.
The more that you deliver things that your list values the more they are willing to do something to reciprocate.
So how does that make you money?
Ask them to help you test your new product, pay for it a month from now if they are satisfied and either way they get to keep it.