I simply shoot more .22 lr at each trip to the range. The basics are the same. My carry gun varies with clothing, but is most often a P32. No 250 pound zombie weight-lifters around here. In fact, crime is so low that even speeders are notable in the local paper.
I also CCW a Taurus PT101, and a Colt Officer's Model in .45 ACP. Each is shot on every range trip, probably three magazines of each.
Cheap ammunition won't make those who shoot once a year shoot more. That's a red herring. They shot once a year when 9mm was $6.00 a box.
Using Law Enforcement as a barometer is also bogus. It's not the cops who are survivors of shoot-outs picking the platform, or the caliber, it's the administrators and accountants. Money is God to them. The only time that caliber intrudes is the possibility of getting sued over it.
The military regards the pistol as REMF use. It's not designed for offensive use, except in very specialized cases, and isn't expected to be useful for more than the time it takes for appropriately armed forces to arrive.
Shoot what you want, it isn't going to make a bit of difference to anyone but you. I own a dozen 9mms, a half-dozen .40 S&W, and a dozen .45 ACP pistols. There are those that I shoot more than others, because of features that they possess. As far as caliber goes, you have to hit first, and smaller calibers tend to make that hit, and where you hit, more important.