First of all, the demand of the guy selling the vehicle is not at all exorbitant (not to forget that the price is further negotiable).
Secondly, if someone feels that the demand is unreasonable then he/ she can simply not buy it and look elsewhere. Why to pull a pseudo mullah fatwa of halal and haraam over it. Even if you consider islamic rulings on the matter, the guy (and the dealers too for that matter) are not being unreasonable. Buying Toyota is clearly not a necessity, it’s a luxury (atleast by Pakistani standards
) . Neither is it the only car manufacturer in Pakistan, that you have no other option, but only a Corolla to choose from.
You guys seriously think that for a car that takes atleast 6 months to get delivered to you, would be offered for immediate purchase at the exact ex-factory price.