A fallacious analogy I'm sorry to say.
An R8 actually costs more in materials and workmanship to produce than a Skoda. The UI in your is software only a UI, merely a set of graphics to relay computer instructions. It's a good UI, yes, doesn't mean it's somehow magically more "premium".
software takes time and effort to make, along with processing power to render/animate etc.
more money spent on research and design will produce a better feeling ui and may require more powerful hardware to run at a good pace.
A ui slapped together in a night by an amateur will be poor comapred to the 100th iteration of design implementation, testing, improvement of a proper UI.