Don't forget that the purpose of the Internet Archive is primarily to be an open archive. In that sense, I'd imagine that bandwidth use is not really a factor,

Don't forget that the purpose of the Internet Archive is primarily to be an open archive. In that sense, I'd imagine that bandwidth use is not really a factor, and anything that contributes to the longevity of the archive is welcome. "It's costing us bandwidth" is only a relevant factor if your goal is to turn a profit, and the bandwidth use isn't contributing to that. An archive doesn't have the same considerations.