IMHO, that's a bit too low when it comes to what such ranks usually earn on a monthly basis [in this forum].
This is just an example, i believe just the lending & gambling projects the single sponsor already can pay at least thousand of USD every month for the campaign. And if the moderator able to bring in 10 sponsor, the minimum sales is at least 5-6 figures, and the commission a moderator can get is at least 4 figures of USD per month.
SFR10 is talking about the earnings of the "webmasters" aka the siteowners aka the content creators, well its awesome that the moderator and your services will be earning 15% each from the campaign but think about the hundreds of siteowners who will be dividing everything once you get your cut. I cannot imagine a proper website accepting into this kind of terms where they don't earn by how many views they have or how many impressions they get from their visitors but from what is left from the commission they'll be sharing with others. If you want more promoters/carriers of your ads you shouldn't think about yourself first but the ones who will be carrying your banners.