[saalweachter]

What do you mean "a legitimate need"?

Why do people need paint in more than one or two colors? Why do people need multiple styles of clothes, beyond a "summer uniform" and "winter uniform"? Why do people bother to maintain both vi and emacs when only one is necessary?

Most of the time, any tape will do, but sometimes you want the perfect paisley to complement your wrapping paper choice. Since most people don't care most of the time, most stores that sell tape won't have more than one or two kinds, so you go to a specialty retailer to find the unusual stuff for unusual circumstances.