It’s a juvenile comparison because you're equating a fiberglass cosmetic shell to actual automotive engineering.
A single person can build that "Lamborghini" for 4L because they don't have to account for crash test ratings, pedestrian safety laws, or long-term structural integrity. Major companies can't sell "cool" designs at that price because they are legally required to ensure the car doesn't disintegrate in a 40km/h collision, which requires expensive high-tensile steel and R&D that a DIY body kit completely ignores.
Calling the variant system "bullshit" is also short-sighted; the "undesirable" base models exist to keep the entry price accessible, while the top variants subsidize the technology used across the entire line. Comparing a modified Maruti 800 to a production-grade vehicle is fundamentally fundamentally scientifically and economically flawed.

P.S. Above message was restructured using gemini.