Burch's Law (introduced here) states that
"I think people should have a right to be stupid and, if they have that right, the market's going to respond by supplying as much stupidity as can be sold."
While Burch was referring specifically to SUV's (which he believed to be badly designed) his point carries far more generally. Examples include:
A corollary of Burch's Law is that any bias should be regarded as a potential vulnerability whereby the market can trick one into buying something one doesn't really want.