Now that I've learned the difference it's one of the things I check. It's not a deal breaker for me anyway although I do prefer centering machines. It's just good to know. I think I would be a terrible sales person. I'd tell them if it was left homing or not and why it might matter. OTOH if we're selling machines and we're members of this forum, chances are we have more than one to choose from anyway. I'd try to match a machine to the buyer's needs. Worst case is I'd sell one and have an excuse to go get another.
Rodney