True, true, variety is a good thing. However, having TOO clean a skin breaks the illusion.
Look at my tan JG27 109E skin. It just doesn't look good. I will redo it with more weathering some day, but for now it annoys me.
My very first 2 skins were rejected because I also went the "factory fresh" route -- no stains, no mess, no exhaust, no nothing.
I thought I wanted them that way, but I look back at them now and cringe badly! Don't let the fact it's one of your first skins dictate your lack of weathering.
It can be "clean" but you need to break up the solid colors with some subtle patterns. Something. Anything. Solid, uninterrupted colors look like MS Paint, if you see what I mean.