Servercosts are 100$ max.- per month, not per day. So this it can´t be it. And the website looks crappy and homecooked, so no costs here either.
8700$/month tax-free could be one or more qualified full-time employees, depending where they live. Question is really if 100% of a persons work goes into it, I highly doubt it. And even if, the second question is still, if so much money should go there and no e.g. only 25%, to only deal about real spam and ignore all the questionable cases which HW loves to take care about, to the detriment of many ex-users.