It's not a mistake, it's greed. GMK gives a certain number of colour matching attempts for free, and after that if the designer still isn't happy then they have to pay for further rounds.

This is happening because rensuya not only has already made all his money from this set, but has learnt from past experience that fucking over his current GB customers won't hurt future sales.

He has done this three or four times already and each time just makes more money. People keep buying the sets though.