If he didn’t upload it at all, they would also have to go through to process of finding a copy of the release and scanning it themselves. I’d say he’s saving them at least one step regardless of how he uploads it.
If it’s more than 0 time units, then it’s more than you can reasonably ask of them. If you don’t think it takes any time at all, you are welcome to download and process the image and upload the “usable” (by taggers? whom? different audiences have different requirements) version. It is easy (or possible at least 
) to derive all the various versions you want from @rdswift’s upload, but if he had “cleaned” it, it would be very limited what would be possible to derive from it.
Apart from some cropping-and-rotating directly in the scanning software, I’m uploading unedited scans (often of library copies, with library stickers and all). Scanning the cover art and uploading it is already adding a lot of time to my editing process, and I just don’t have the time energy to spend another .5–2 (or often up to about 5) minutes on each piece of uploaded cover art, I would probably just not do it. However, like @rdswift, I’d be happy to see other community members pick up my scans and turn them into more “usable” versions.
Also, this whole discussion reminds me a bit about: