While collecting a full set of MAME roms, I am wondering if it is truly valid to collect the "clones" of parent roms with MAME. The basic idea of MAME, I think, is to play the original arcade games EXACTLY how they played in the original cabinet. Therefore, it seems that the parent roms are of most importance and the clones would not be particarily important. In what instances would it be a good idea to have all the clones as well. I currently have all the "games" of MAME 0.77 (2,622 as listed at mameworld.net). Should I worry about not having all the clone roms to add up to the total roms listed at 4,640--are they used ever anyway?
Thanks.