Mystic Coins
Most likely they’ll shoot back up with the release of new legendaries, easier to attain precursers or new mystic forge exotic recipies.
I see Mystic Coins as a good way to invest. Sure everyone can get them from daily and monthly bonuses, but the speed in which they can be generated is fixed (unlike Ectos and T6 mats). There are a lot more people who need them for high level crafts, thus will always have a good demand.
You never know what Anet might do. One monthly in the future may require Lv 50 Fractal completions. Prices would surely jump then!
The price of mystic coins started coming down from around 15s in January. My guess is that most people who bought the game from release and wanted a legendary had finished by the end of Christmas (or gave up due to precursor prices) and so the demand went down. We’ve heard that there’s been a lot of new players coming to the game this year, which means there’s likely more people selling coins.
However once a higher ratio of people reach the “end game” of acquiring fancy weapons, the demand will rise and the prices no doubt increase. I used to sell coins before I had a use for them, but now I always hoard them. Plus any announcement about new legendaries or the precursor scavenger hunt will likely cause prices to skyrocket.
In my opinion they’re definitely a safe investment. The question, as always, is how long term an investment it will be.
They are a good investment at anything below 6s I believe. They fluctuate to much to give an honest opinion of where they might end up. But on the other hand Anet does love to use these for high ens recipes so you never know when they will shoot back up.
Safe investment.