I don' t understand why these are expunged, the lossless PNG have obviously better quality than the already uploaded JPG, obviously not artifact free. (and even with very small compression, the colors are less vibrant in JPG)
There is lots of completely useless pics like the censored thumbnails or system pics that could be harmlessly removed, but somewhere i understand that it would not be a 100% complete "source rip".
But i think you could improve them by reorganizing pics: first pic the cover (only pic visible from the front page, so it' s better if it' s not a background pic) second the cg, the heart of the archive, so we don' t need to search where it starts. then the backgrounds. and finally the chara, system & thumbnails. (less useful parts)
So we can browse the most interesting part first.
A torrent would be appreciated too for these very large source rips, because there is no point spending that much GPs for half useful pics.