Lots of businesses taking payments online get the overwhelming majority of their sales from visitors with a "first-world perspective". It can make complete sense to blanket-ban TOR and other signs of bad actors at a cost of 0.1% of your sales (not an unlikely figure).
I like the idea of an open free-for-all Web, too, but I don't expect businesses to stop doing this, given the incentives in play.
"TOR traffic" is as undesirable as regular traffic, no more no less. From first-world perspective, this maybe skewed towards TOR, but elsewhere TOR is used as everyday, lifeline resource.
From data volume perspective, maybe you are correct. From number of users perspective, I do not believe so.
>If you're running a business that accepts credit cards then it's completely negligent to not block TOR traffic.
Blocking a set of known bad exit relays should be blocked. TOR in general, no.