So far in almost a month there haven't been any volunteers to contribute, people just use the spreadsheets to search, sorting the rows and sometimes leaving it in a messy state. I have to revert those changes a bit too often, so I'll set the sharing settings to comment-only. This way people can sort and filter for themselves only, without worrying that something will break, and I can maintain the spreadsheet a bit more easily.
If you'd like to contribute, either leave your comments in the spreadsheet, or even better I can give you edit access - feel free to ask!
I still firmly believe that over long enough periods of time this collaboration idea will work.