Hosting costs depend on how much bandwidth is required. Text does not eat up that much bandwidth but when we post images that's when the usage jumps up.
I would not expect that the board owner would provide this exact information because it is not the business of the general membership.
Images are hosted elsewhere, preferably at image hosting sites although many here hotlink
their images, either way we only provide the path to where the image is hosted, when that host goes down so do the images on the forum.
BTW, hotlinking isn't disallowed in the forum rules at this site, even if it's frowned upon at other sites and/or against their rules. It's basically stealing bandwidth.