I do not think .22's are a waste of money. Just the opposite in fact. I own 6 different .22's at this time. They are by far my favorite caliber. They are quiet, cheap to shoot, and no recoil. What's not to like? You can afford to have a lot of fun with these guns.
The only problem you are going to run into right now is ammo is nearly impossible to find for them. I think this will settle down (at least I hope it does) in the next few months. But here in Utah there isn't a single box of .22 to be had.