I don't think handgun skills degrade so rapidly but in any case, I'd say all of the round counts are way too high, even if you're shooting just .22s. These numbers represent over a hundred dollars a week for one thing and for another, I even think your skills peak rather quickly. In short, I'd say the two choices are both impractical but my suggestion of shooting no more than your normal carry load is probably equally impractical.
What he said. Generally, by the time you shoot several magazines say a box of ammo you are beginning to get fatigued. That causes you to get sloppy, then form suffers. I can really notice the nerve fatigue with my J frame 357, after an IDPA match of about 100 rounds of +P+ 38's my hands start shaking a wee bit.