I shoot a lot of 9mm myself ( a 1911, 5" gun is my carry gun / I shoot 6 or 8 boxes of 9mm a week for tactical practice / I shoot 3 boxes a week in a "buddy tactical COF match )... so about 10 boxes of 9mm a week. I also have 10 grandkids now...and 8 of them are of shooting age ( from 10 - 25 yrs old )...and they go thru a fair amount of 9mm as well... ( and some .40 S&W, .45 acp, .38 spl, .357 mag and .44 mag...) ..
So I reload a lot of 9mm... 30,000 or so last year.../ and my calculations because I buy FMJ bullets in case lots of 4,000 / primers in case lots of 5,000 / powder in 8 lb kegs / and I shoot at an indoor range where I sweep up a lot of brass. Sorting and cleaning brass is just part of the process. But buying in case lots means I can load 9mm...with a premium Montana Gold 115gr FMJ bullet for about $6 for a box of 50 rds...or roughly half of what retail ammo costs.
So to me, using the same ammo budget in 9mm...because I reload, I can customize my loads to whatever I want..." some max power loads, some bunny fart loads...whatever..."...and it means I shoot twice as much - on that same 9mm ammo budget.
As a note...lately, I have had a problem seating primers in Winchester brass - even seating Winchester primers. My hunch is Winchester is sourcing it offshore...and the quality has changed. Its just part of the evolution of things...