Does no one else's LFS quarantine their new stock?
Would you bet your existing stock that their procedure is as good or better than your own? How often is the advice from your lfs as good or better than your own? I know exactly what happens with my tanks & fish, I can't say that for any lfs, or other aquarist for that matter.
Of course, blind faith isn't going to help us much. When the quarantine tanks are on display (and before you say, yes the pipework is separate) you can know for yourself how long they are there for (roughly, depends on how often you visit).
Surely the LFS has more to loose if they infect their entire stock/tanks?
When was the last time you heard of an outbreak in a LFS? (I never have, and im not assuming it's never happened so im curious to know if you or anyone else actually has).
And if home aquarists only QT for 1-2 weeks - isn't that another bet?
I think the trouble for a lot of people is the cost and the space. You're basically setting up another fish tank with all the same costs (and cycling needs unless there's a secret I don't know). For someone like me starting out, been cycling for 67 days it's a very daunting idea and to be honest, I like the fact there are some experienced in this post saying they don't do it. I know that's bad but you can't be surprised if some people look at it that way.
You don't cycle the tank, you cycle the filter.
You can get a cheap filter put it in (treated, obviously) water and pull filter media from your mature tank and have it running almost instantly. Various people run in buckets etc, and don't even need to be that big and could just sit it on the floor, big ugly but up to you. A heater for QT would be cheap and can be seen as an emergency backup for your main tank too.
I don't think many people will say
don't do it, it's more... is there *that* much of a need?