Remembered that I got a phone call and posted that before I was quite finished.
I agree the rimfires are a help, they fill a useful niche between dry fire and live fire with centerfire work, besides just being a lot of fun, which also helps keep one interested and shooting more. If I had unlimited free centerfire ammo, Id still shoot rimfire quite a lot. If one hasnt tried them, Id suggest borrowing one for a while and see how it goes for them. It may not suit everyone, but if one hasnt tried them, they may be missing a useful tool.