And when figuring out "how many users is enough?" I think I would just use common sense and think about it like a business owner. If you had 100,000 monthly vie

And when figuring out "how many users is enough?" I think I would just use common sense and think about it like a business owner. If you had 100,000 monthly views or 16% of the Baltimore population could you charge a local business $30-$50 to advertise for a month? Absolutely and that would be pretty reasonable. You'd probably sell out quickly and be able to raise prices from there :)