Assuming exterior materials are the same, engines and interior materials, of course it should. Take the BMW core models of the 1 Series/3 Series/5 Series/7 Series. All get a bit more expensive in quite a linear way. You know full well the 6 Series doesn't cost much more than the 5 Series to build and develop, so it's a good profit centre for BMW. And any situation where a company is reaping a large profit margin (not saying BMW is wrong for doing that) means it's overpriced, because the production costs are not reflected in the selling price.