There is a large difference in cost of mats between cp 150 and cp 160 gear in this game. Max level crafting writs call for you to make cp 150 gear. This is a recipe for disaster with how the interface operates in this game. As we know, there are 'big' armor pieces like legs and chest and 'small' pieces like the belt, shoes, shoulders, etc. Apologies beforehand if this is poorly worded.
If a writ calls for you to make let's say, Cp 150 ancestor silk robe, breeches, and epaulets, you only need to spend about 30 silk. However, if you are on the robe and accidentally move the arrow over to a cp 160 item, see your mistake before you make it and move the arrow back to cp 150 then scroll over now to one of the smaller pieces, the setting will still be for CP 160. I have wasted a lot of ancestor silk because I always do my writs in the morning before I leave for work and am in a rush. Yes it is still my fault but if you have 1 piece selected at CP 150, the value should not change while scrolling to a smaller piece just because you accidentally had it at 160 with a small thumb-stick movement (very easy to do on Xbox) and moved it back to 150 before scrolling to the small piece. I have adjusted my crafting to just go extra slow now because I am sick of wasting silk but I do not want to see other players fall victim to this.