I work at the local Pet Supplies Plus in PA, and we had a nasty bout of ich from a fish that came in with our delivery. So we ripped everything out, recured the live rock, got fresh sand, new UV
sterilizers, phosban reactor, and a new skimmer. We decided it was better to actually tear the whole section down and restart, rather than get fish to sell that may contract ich.
We care about the livestock rather than the sale. If something is sick, it gets quarantined.
So not all LFS
are bad. =)