I can already hear the complaints. There are some people who are content to leave their armor the default ugly greenish-gray and believe that dye is a waste of money. There are others that say "why don't you just mix dyes to get the color you want?"
Well to the people who don't care about dye, all I can say is go to another thread. It's a matter of taste. Some people WANT their characters to look good, or at least different, so for them it's not a waste of money. (I've seen others in basic green-gray FoW armor ~ what's up with that?

For those who think I can MIX any color I want, think again.
Ever since the inception of the DYE PREVIEWER, dyes no longer mix logically or even well. The SINGLE dye colors are nicer and more vibrant than they used to be, but mixes suck. Pink being the most asked-for color that can no longer be created. (Yes, SOME armors, most notably METALS or very light-colored stuff can still attain pink. But most cloth and leather armor is more "puke" than pink.)
With GW2 as the main focus of the design teams nowadays, I have given up on the idea that they will ever fix dye mixing. So give us a bigger selection of basic colors to choose from at the Dye Trader! That should be easy enough.