You say $40 - $4000. Do you guarantee that $40?
My guess is you cannot, so maybe review your offer as not to leave yourself open to people saying you didn't deliver, as one of their sites only made let's say $15 last month, and asking for refunds...
There are people that will ask for refunds for the slightest "error" in an offer or ToS. Just looking out for another BHW buddy.