I have ~8 25 round magazines (I think 2-3 of those are 10 round long magazines with the limiting pin popped out), 1 10 round magazine (for bench work), 4 Salem 6 20 round magazines, 4 32 round plinker tactical magazines.

I don't use the plinker tacticals or the Salem 6 magazines much.

IMHO, more magazines is good IF you are paying for range time. You can load up 200+ rounds at home and not pay for it.

If you are not paying for range time, the extra magazines aren't as useful (IMHO) because it allows you to slow down your firing rate a bit.

The truth is, having extra magazines is always good, even if you're not using them.

Also, there is no worry or fear of keeping them loaded. Springs do not wear out due to being compressed; they wear out from repeated compression/decompression cycles.

HTH