Given that I hand-raise my mags, and I'm 3 mags away from finishing all of my character mags, and have used some quite pricey mag cells in the last few months, this would be very bad for me.
Not to devolve the thread into a suggested changes thread, but I'm also against this just because it would be a fundamental change to the game. I think it would, however, be loads of fun to have something seasonal where there was a server with unique properties similar to classic mode, where settings got changed on a whim at any time. Change max stats for a month. Unlock all weapons for a couple weeks. Buff G assassin sabers permanently. That sort of thing. Give us an outlet for our crazy desires without impacting main game.
Back on topic... mag price should probably eventually stabilize to 3-5pd for basic options. I'd call 3 for a cell mag (plus the cell), up to 5 for a 4th evolution with a bad table. Any higher and there's no reason to buy when you can raise your own in short order. Any cheaper and you are barely covering food costs.