What is worth spending and what not?
This is just a personal opinion, but I feel there can be a topic on what and where it is wise to spend gems and how to make the best of them.
What I personally feel as gem wasting:
1) Summoning in the rune temple. You do get a good rune and a fragment, but if you wait long enough, you get these runes too. Also with a cost of 200 gems it is a bit overpriced in my opinion.
2) Buying mysterious chests. They are not worth the value, surely not if you buy coins and credits for 10 gems in the fair. The only exception might be if you buy a chest on Wednesday with the extra coins if you want to purchase a black horse mount. Then you can purchase it for 99 gems with the coins you get, instead of spending 200 gems on it. On the other hand: I do feel mounts are not really an extra to your game and not something to waste gems on.
3) Flipping an extra card in the Tavern. This costs at least 10 gems and you in most cases still not get the hero you want. Better be happy with the spirits and summon it later.
4) Buying scores in the labyrinth. If you train it long enough, you get easily 90% 500+ scores without having to purchase them. By the way: if you spent enough to be at that VIP level, you did spent month of salary at once, or are already trained to make the best of it.
5) Spending over 5 gems on cooldown. (this is just personal feeling)
What I consider worth the money:
1) Guild investments: since they might give you extra reputation and contribution, so you might upgrade some guild techs that might give you benefits, or chests that might also get you good stuff. Also you will certainly need 100 contribution to claim guild benefits.
2) Unlocking sockets for chips in your equipment. The more you can imbed, the stronger your equipment gets.
3) Purchasing reduced price medals for upgrading your stars in the fair or labyrinth, especially on Friday.
4) Buying some coins and credits in the fair or offering in the shrine if you just lack a little coins or credits.
5) Reducing cooldown for talents and equipement when you got the coins and credits, but not the time to wait several hours. (hint on this one: if it takes longer than a day to cooldown, you might use your credits for the tavern and the coins for upgrading runes while you are waiting)
Of course, you all have a reason to disagree. What options do you think are worth your money in this game and which you consider gem wasting?