There is a reason, perhaps, to promote a simple Ruger 10/22 higher up on the Master List. Quite a few reasons, actually.
I can shoot it more places. Even at an indoor range. Can't say that about the M1A.
The ammo is certainly cheaper.
It's not that expensive a gun.
It uses magazines, so you can simulate practicing with a magazine fed major caliber rifle like the M1A with the cheaper quieter .22.
A lot of practice with a 10/22 is less scary to the hoplophobes if they see you doing it.
If you add an after market Peep Sight to the rear it trains more like the iron sights on an M1A.
If I ever go to an Appleseed, I'd probably want to bring a 10/22. For cost reasons, alone.