Well for whatever reason most forums/fansites tend to keep this information private, but I'm not entiarlly sure why.
RuneCrypt currently costs 165$ / month to run and maintain between server fee's and cpanel integration.
That is VERY expensive, which is why some people may have heard rumors about us looking for a new host. (Seriously, I have yet to find a host that actually charges as much as our current host - I would not recommend them.)
On an "Average" month, RC makes approx 70-90$ from advertisements. That covers about half the cost of the server. (The past 2 months have been FAR below average, but that's just a market trend - sometimes the advertiser just fails to deliver a solid amount of well paying ads).
That means I end up fronting about half the cost of the server, while the ads pay for the other half.
Now to give you a rough idea of how much of an impact ad-block makes.
Lets say we have 10 ads that avarage $1.00cpm each. That means I get 1 dollar for ever 1k views that each of those ads get. Now each ad will have its own limit too how often the same person can say it, so for the sake of keeping it simple we'll limit it too twice a day.
So, lets say this person see's all 10 of those ads, twice a day for 1 month. (effectively the maximum fill rate of those ads for that person.
That 10 ads, 2 views a day = 20 views a day X 30 days = 600 views a month.
Since each of those 10 ads gives me 1$ per 1k views, I just made 60c per ad, or 6$ - from one person.
Now that is a VERY bloated figure, as it is extremely unlikely that 1 person would come close to seeing 10 ads twice a day for a solid month, especially since there are ad prime times etc - You'll see more "Survey" links at some parts of the day then others.. It gets complicated. (Hell, even demographic regions have something to do with it.)
Its very simple really: The ONLY money rc brings in is from ads. Not viewing those ads removes that source of income. Obviously I don't run RC with the intention of making profit - I would have too use a MUCH more invasive advertiser to pull that off. (See RuneHQ's talking ads)
Anyway, I didn't mean to make that post as long as I did, if anyone is actually interested in more in-depth details as too how a site like RuneCrypt brings in money, or random ad stat's I'll post them - but its really all very boring.