Everybody else either HAS to drive for whatever reason and will suck up the extra $15 or is too rich to care. It's a pretty naked money grab by the city precisely because demand is kind of inelastic.
You can imagine anything else being taxed in the same way. If the government decided to raise money by making your cell plan cost 3X, you'd grumble but pay (it's not like you're gonna give up your phone) It's not a great reason to tax.