Yeah, I have to agree with Fistful on that one.
I have all sorts of 10rd mags for my autoloading rifles. They're really nice to have for sight-in, prone, deer season, new shooter training, you name it.
We don't need to eat our own here, AZRH44. Those 10 rounders may not be your cup of tea, but they're far from being FUDD items, and I doubt they really taxed Magpul's production capacity.
I could certainly forward a request that the president of Magpul commit seppuku in your honor, if it really chaps you that much.
Of course, there's no reason you couldn't forward that request yourself. Maybe they'd then save face by putting you on the board of directors, too.