doesnt hurt a spring a bit being compressed or uncompressed. the act of loading and unloading the mags is what wears the spring out.
think about it like this:
bend a wire and leave it bent and it wont break regardless of how long its bent it will stay in one piece until the end of time if corrosion isnt a factor. keep bending it repeatedly back and forth and eventually it will break.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent