Quote Originally Posted by Squintina View Post
You only need them if you're trying to score 100, which so far as we can see is only used for an achievement, so you only need to do that once.

For every other time when you're not going for 100, using the cheaper dyes in the same color category as the "right" one will still give you partial points.

All I bought this week from MB were highland boots (as cheap alternatives to the cashmere boots), then dyes from NPCs in the same color categories as the correct dyes, then a kilk from an NPC and the scion jacket from Recompense Officer. Farmed some Shiva for the bracelet. Easy 84 for the full MGP prize.
This is all correct. There is only one achievement for obtaining 100 points, and no cumulative achievement afterwards. There are cheaper alternatives to get above 80, which is all you need for the additional prize. The amount of complaining about this optional minigame has been absolutely ridiculous.