We prefer a default SD card when it comes to competitive play. I have no doubt that your skins would be perfectly acceptable, but that can't be said for everyone when they add skins, character models and textures, and alter stages in any way. Rather than say "That's fine if [insert specific criteria]" we are just forced to ask that folks bring a clean, default copy of PM. Thanks for asking rather than assuming. =) I cannot stress enough the annoyance of folks bringing their setup only for it to be put off to the side and be competitively useless due to further modding.