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It's money vs merely playing the game... I didn't enjoy I was forced to play the boooring SP portion of it to get those skins you mention but at least they made those easily available for everyone, unlike Golden Scorpion that was never available (not even by paying for it!!) up until recently...
I bought the skin for Sub Zero back when I started using him a lot and now that I no longer play MK XL, I see it as a stupid decision that they never gave us the option to get Golden Scorpion by any means. >_>
The ultimate victory is the one conquered over yourself.