The reason your dyes may be sitting unbought also has something to do with price. If I need a piece of gear, I'm buying the cheapest...at least until I get to higher level gear. If that means it is uncolored or pink, I'm wearing it. If adding color makes it cost more or if the overabundance of a certain dye requires you drop the price..*SPOILER ALERT*....that IS economics, plain and simple. I am not going to pay more for gear because you farmed dyes....you can bank on it. If you level your char, most gear is outdated quickly enough that having a color coordinated set of Canvas gear is not something upon which I will waste my gil.

Pink items often sell for less than other colors---is it because of demand or market over-saturation of pink dye? I don't care, that's the economy. I just buy it because it can sometimes mean a difference of better than 50k in price. That's economics...plain and simple.