Destructavator, http://xserve.ninex.info/
Yes, but the server host other projects as well.
Looking at the forum admin panel, which shows the *real* amount of space for attachments (which has been increased a number of times already), we only have about 1 GB total for attachments - much of which has already been filled in this forum which goes back for several years.
Many of these screenshot posts (with four pictures) are near the 1024 KB per post limit. That means if there was ~1,000 such posts, it would all be used up, and as I said much of it is already filled (take a look at the large number of posts on this forum, going way back).
If you do the math, it can add up when you have a thread filled with image after image. If this thread grows to a large size, it might eventually become an issue.