First, I doubt we'd make that much off of that sort of system. But more importantly, we're not here to sell stuff or make a profit. Transparency of purpose is important for maintaining integrity in our area of interest. This is why we are run by donations, and this is why the donations go directly to our hosting costs.
This is also why we have no banner ads or webstores pushing herbal ointments or charmed amulets, and no charge for any articles or classes. The information, teaching, and discussion provided here are done with no competing interests, so that people can trust the sincerity of our community.