Actually, the scans on VGMdb are provided to non-users, too... When you view an album page as a visitor you don't get the complete list of scans, but you can still view+save low-resolutions samples of them. Anyway, you're right, the bigger problem might come from the publishers.
Now, this is my personal view on the matter, but even sharing/hosting scans like this website currently does might be rightly considered a form of "piracy".... Such stuff might be source of information, but it's always material as copyrighted as the music... I say: "Allow one? You might as well allow both, since there isn't really much difference between the two." [just kidding, eh, don't worry
]
I think of VGMdb as a sort of very useful, lightly-warez website.