Selling leads? How much to charge?

[Kenneth E.]

I have managed to create a proprietary list of leads for my local investing area. The problem is that my massive list contains about 22k vacant properties, which I wont do anything with.

At least one local investor is willing to purchase the entire 22k but I have NO CLUE how much to charge him for them.

I have always created my own leads lists and never purchased them from listsource .....so I don't know what the going rate would be for such leads from that angle either.

Any help on what to charge?

Thanks!