I think it's much closer to reality to assume that the aesthetics of a given thing are interesting to the artists or sculptors, and reflective of the way pop culture can shape fashion and aesthetic, they add them in as fun nods to things. Do they always suit everyone's tastes? nah. Nothing does. But that doesn't make it lazy or greedy. I'm not naive, I know that every single model in the game is intended to be sold, but, if it were purely laziness/greed, and the idea is that these inspired-by characters are the laziest / cheapest (?) then every model would be one.