This entire system is fantastic, Dave!
I think the tallies are a valuable feature for the actual swapping process. Being a 'seed swapper', especially in group swaps like this, I don't know how many times I've had to double and triple check myself to make sure I didn't miss anyone or a seed pack. It can easily happen during the thrill of the moment (as you witnessed during the actual swapping) and you confirm all of your swaps. Now I don't have to go back and mark the seeds, going to whom, etc. because the system is calculating it all for me.
The tallies eliminated all of that! I can look at the auto-tally and know exactly what is going out and coming in.
Awesome!!!
RE: The need to know how many, it could be helpful when looking at your seeds, it will coincide with the tally; if I'm offering 5 packs of marigold and 3 people have asked for them, then there should only be two packs left- if there are 4 packs left I know I missed giving them to someone.