One of the big selling points of the SP2022 is it's price. Basically, you can get a Sig for less than a Glock. Oh, but we're going to hose you on mags. And when you want to buy more later, we're going to charge you $15 more than Glock does per mag!
The 2022 is a good gun, but for those of us who like having a bunch of magazines, you're not really going to save any money.