[frankbmd]

It's even better to have 17 spreadsheets, then you can always find a discrepancy between spreadsheets that look at the data from a different perspective. This results is hours of mindless research to resolve the conflicting data. After a while, once the spreadsheets get large enough, you'll find that you don't need or have time for the cards.

A large trade must be weighed in terms of how much time will be consumed entering the data into your system and making sure there are no conflicts when finished.

I'm seriously considering just keeping my cards and trading spreadsheets instead.