brentn,
Sure, leaving a spring compressed causes no problems...right.
People parrot this all the time (I wonder if they are South American parrots or of the Central American variety...or maybe the "Froot Loops" Toucans do it, too.). Springs CAN take a set...plus there are other gun problems associated with metal hitting metal with no resistance.
You certainly can do what you want with YOUR guns...I just wouldn't want to buy any used guns from people who dry fire.
That is, IF they were honest enough to admit to doing it at the time of sale...which I doubt. Yeah...that's a great selling point, "I regularly dry-fire my guns." Red Flag and I walk.
But I won't argue this any further -- say/do whatever you want -- but we fall into two simple groups here: Those who fry-fire and those who do not.
To each his/her own.
-- John D.