What is wrong with buying ammo to source reloading brass?

[Tangodown]

I’ve found Hornady brass regardless of caliber to be horrible

Lapua when I can get it

Starline for calibers Lapua doesn’t make…..especially handgun calibers.

I actually bought 100 cases of sig sauer 30-06 brass and it was unbelievably consistent…….I was quite impressed. Varied 1 grain and the neck concentricity was about perfect.