I disagree. $100/day is a very fair price for the right to operate a business on public space.
A business license is a drop in the bucket. Every business needs one. Unless you're councillor Alto, that is.
Every business requires investment. Just because there is a cost to operating a food cart doesn't mean society needs to kneel over and lend a helping hand. Nobody cares when an average food service storefront incurs thousands in opening costs, if not tens of thousands if there is any remodeling or renovations to be done.
Given that New York, and closer to home Portland Oregon, both have thriving food/cart/truck communities does anyone have any idea how they are licensed and what the accompanying costs may be?