no such things as 'low ball' la. Anyone looking in the bns will be looking for a good deal.
if someone selling 1 item 1400 but I only willing to pay 1200. I will offer 1000, then hopefully can come to consensus at 1200.
The only low blow i can think of is getting more crap than you wished for.
an unreported fault,
missing/very late payment,
massive bitching/defamation (during or after sales),
If no trade was done, what low blow is there? It's standard bargaining.