You couldn't be more wrong. There is no tax. 5% import duty, that's it. Most cars are 20-30% cheaper here than in Europe. The $150k tag is probably because:
1) Almost all cars here are brought in fully loaded. I mean every options box that exists is ticked. Your $90k car is basic list price before the box ticking starts.
2) They will have a very limited allocation initially, all presold to local Arabs that all have 10 cars each and more money than they know what to do with. Probably once that supply feeds through the price will drop.