That's really the underlying factor though, a MB Quart 1500W can be had for just pennies more than an AQ 1200D, making it still a better value for the price than the AQ...but the fact remains that because MB Quart isn't an "underground" company, it won't have people hopping on the bandwagon as quickly.
tl;dr, people buy specific car audio products for stupid reasons. Like people who pay $350 for a Sundown 1200 //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif