I wouldn;t look at it as HOW much are you going to shoot, as I would, what firearms am I MAYBE going to shoot it thru and use your own judgement on risks , or savings!
things can go wrong a few rounds and NOT always need hundreds or thousands to have a issue
I have seen AR -15 firing pins break in a few boxes of steel cased ammo, not a huge deal or costs,. but is down time and can maybe ruin a guys plans of shooting longer!
on flip side again, I have never seen it bother a AK EVER!
as I said, some guns are just more sensitive to things and well, on a very high end firearm I wouldn't risk it at ALL< not worth the penny's in savings to use in a high costing/tolerance build firearm IMO!