Weber is known for their black grills, the only other color weber has used was stainless steel. Given the way smoking is and what it does to the stainless steel color I can only imagine they felt black was better. On a stainless steel model when you smoke it actually turns your steel a brown and yellow color. Which eventually turns to black after the natural heat hardens the smoke. In doing so it would turn black anyways, so because of this I imagin they painted it to give an already seasoned look.