A bad digital trader would be someone who agrees to send a show to one person in exchange for another show digitally and then one side doesnt finish the send. I.E FTP Trades or private torrent trades.

When you seed a show to a torrent site like this one, you're not trading anything, what are you getting in return if you seed a show? The satisfaction of a shitload of people getting the show? The word trade does not apply. Bad sharer, yea, but its not a trade. You may get someone to seed a show you want, but thats still something on an individual basis.

The logic is completely flawed. I can't understand anyone assuming someone is a bad snail mail trader simply based on the amount of bits and bytes uploaded.

The word trade does not apply to torrents unless its individuals saying Ill seed this if you seed that. If you put it on a site like this one, theres going to be leechers, especially if said site doesnt enforce a ratio and a lot of times the leechers cant seed a significant amount for a variety of reasons.