Danbooru Finances

So..just wondering, how does Danbooru finance itself..? I know it gets money from ads but with the picture amount increasing day after day you probably have to keep increasing your limit and pay more for a server. While your space needed is getting higher, your income is not getting higher. So basically with every single picture more on here you have to pay more and eventually there'd be a point where you the prize will outweigh the income, wouldn't there?
Random thoghts..

I suspect the space needed increases slower than the gigabytes per $ increases, so bandwidth would be more of a concern.

Danbooru likely doesn't need all that much storage. 1 million images at 5MB each is only 5TB, and most images are significantly smaller than 5MB (number pulled out of my behind, correct me if I'm wrong).

Bandwidth consumed is likely much more of a concern, but advertising probably sufficiently finances it. albert would be the one who has the solid details.

I doubt danbooru has had a month in the black of advertising revenue ever, ads just offset the out of pocket cost.