You do have a point! But if you're going to paint the bumpers I'm pretty sure that whoever paints the bumpers must prime and prepare the bumper to the actual paint. I don't think that paint will be peeling so easily or at all for that matter.

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2004 BMW X3 2.5i
Black Sapphire Metallic
Premium & Cold Weather Packages
STEPTRONIC 5-Speed Automatic Transmission
Terracotta Leather Interior (HOT!!!)
Dark Wood Trim
17" Double Spoke Wheels (Style 111)
Scorpion Tires
Panorama Roof (HOT!!!)
Fog Lights