Because it isn't faster and cheaper in the majority of the US. The nearest Pizza place to me is about 2 miles, the nearest that actually delivers? About 4 miles. And I'm within the city limits of one of the top 20 largest cities in the US. Our population densities are on a completely different scale than the Netherlands. Not saying we have good city designs, but as it is, a bike would a terrible way to deliver food to me.