my BMW stock mats stay just fine w/o the clips. Seems like they've got some kind of velcro type bottom side that keeps them still. I agree however that their quality is totally lacking and borderline unacceptable for a BMW.. I can see me replacing them at yearly intervals or more.

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BMW - X5 4.8i w/all US options packages, 19" Y wheels, White/Tobacco, Huper Optik 50% tint
Mercedes Benz - E320 CDI Park Assist, NAV, Folding Mirrors, Premium Sound, Voice Command, Sunroof, Auto Rear Shade, Bi-Xenon