The biggest problem with the winamp.com skins dump is the versioning of skins, plugins, files. They are usually contained in the skins list with a _###.zip (wsz). Additionally, as was previously stated the dumps are also unverified and non-curated. I once had the same idea to upload to a singular location all of the skins for 1001, and knowing that 1001 has all the skins curated, categorized, and versioned still would do nothing in a singular file pool from which users would have to download and privately curate after download; because of how I have stored them.
1001 stores skins by their Id and links to their meta information by filename.
Winamp.com Stored them by filename and linked them to a series of meta information by Id.
Neither site would easily be able to combine both sets of data in a way that would easily allow for self curated content.