I know you didn't, my complaint is probably more towards people who aren't on my friendslist anyway, as most of the people who are comment regularly. I think it's a lot like fic feedback in that way, actually.

Bandwidth is (sorry I didn't explain this better the first time, and I'm probably not explaining this well this time either because it's still fuzzy to me a bit too) basically the amount (in file sizes) that your website transfers. When you share a 5mb file (about the size of most mp3s) that takes up an equal amount of bandwidth for each person who downloads that file. Essentially it's a measurement of internet use. When I upload a file and then other people download I pay for the amount of bandwidth tranfer that the file takes up. wiki explains it a little better.