Boredom is the Mother of the modifications.

Some people, Me included; have no aspirations of ever owning a CP or T REX, etc.

Look at 'stock' car racing when it began and where it is today. Nothing wrong with mods and I think companies look at what people are modifying and You see those reflected in newer models.

I see thread after thread of mods on ALL models of choppers. There's always something else, and that 'else' and the tinkering associated with that keeps the interest level up; squeezing a little bit more performance, etc.

Inquisitive nature is what most people possess;

I fly a full scale Cessna 172; and it too can be modified for better performance.