While I agree that communication is a must, sometimes your suggestions are impractical.
I recently had a bunch of MicroScale decals for sale on EBay, about 70 sheets IIRC. To keep track of all the transactions became I nightmare even though I had an Excel sheet to try and keep track of them all. Different buyers, EBay user IDs, PayPal user IDs, last names and email addresses did not help. Your suggestion with three emails would mean at least
210 emails in a few days time...I really did try to keep up with it all, but I'm sure I dropped a ball or two. I just hope that noone enters negative feedback without getting in touch with me first in case there is an issue. The feedback system is great, but it is not only up to the sellers to be honest and communicate. So far, I have been blessed with only positive feedback - I say this as I have seen some people getting negative feedback for not posting positive feedback for the buyer ! While I do not require that the buyer post positive feedback before I post mine, I do want to know that s/he is satisfied so that I do not post positive feedback just to find out that s/he is a jerk if there is the slightest issue.
One thing that can cause problems is shipments being lost in transit. I always go to the post office to mail outbound items even if they are only letters. By paying there you get a receipt with the destination zip code as some form of proof if the item is uninsured and/or lacking delivery confirmation.
Sten ...stepping down from soap box...