While on a much higher pricing scale, why wouldn't you buy variations of a favorite design? I like (and collect) classic diecast muscle cars, pony cars, etc. I really like Dodge Chargers and Challengers. I have lots of each in different paint schemes because I like the base vehicle. The Mk VII was a great design for a figure. First with multiple exchangeable parts, first with 90 degree repulsor hands, first without the delicate snap in rear flaps, etc. I like the color options. I wouldn't mind seeing a stealth version of the Mk VI. The design lends itself to a black paint scheme. Another example is Nightclub. I hope they do the movie version, (red & gold) and the traditional version. (black & silver/grey)
Just my opinion.