I wanted to put this out there as a PSA for those of you who don't know yet. The new guaranteed item in the Black Lion chests is the Zaishen War Paint Kit. This kit contains 2-5 unidentified dyes. It's basically crashing the dye market. However it does mean you can pick up some pricey dies for relatively cheap. 
Here are some examples:
Abyss   Last week (sell/buy): 23.75/19.19  This week: 13.18/10.5
Celestial       Last week 60.92/48.01  This week: 32.96/25.2

I wouldn't be surprised if the prices went down even further because the chests just changed and they usually keep the same contents for 6-8 weeks. 
If you have extra gold sitting around you could fill out your unlocked dyes, which is awesome for those guaranteed wardrobe unlocks (you don't want to end up with a 20 silver dye from one of those if you can avoid it). You could even invest in the dye market. I'd caution you it would be a loooong term investment though because no doubts tons of people are doing exactly that.

Good luck, have fun, and don't spend all your gold!