The cost changes are for the event as far as I know AnonOmis1000. After that I have no idea.
I thought it cost 4k to make a gold satisfyingMarriage. That would make the total trade up costs to 6 golds equal to 24k. Pretty sure it is 4k so I think I will use that if you don’t mind.
Let us assume a player has traded up for 6 golds. This cost them 4k a piece for a total of 24k. The player has decided to not make a cobalt with their 6 golds. 24 k is less than 50 k the cost of making a cobalt with the crafting system.
Now in order to have traded up for the golds the player needed 4 silvers for each gold. The player needed a total of 24 silvers. The player has to pay a trade up cost of 2 k for each silver that is traded up. Let us assume the case where the player has to only trade up for half the silvers. The player needs to trade up for 12 of them. 2 k x 12 = 24 k. 24 k + 24 k = 48 k. 48 k is still less than 50 k the cost of making a cobalt with the crafting system.
4 bronzes are needed for each silver. The player needs 48 bronzes for 12 silvers. Trading up to a bronze cost 1 k. Lets us again assume we only need to trade up for half the bronzes. We need 24 bronzes. This costs 24 k. 24 k + 48 k = 72 k which is not less than 50 k the cost of making a cobalt with the crafting system.
3 irons are needed for each bronze. The player needs 72 irons for 24 bronzes. The trade up cost for irons is .5 k. Half of those irons equals 36. 36 x .5 k = 18 k. 18 k + 72 k = 90 k which is still not less than 50 k the cost of making a cobalt in the crafting system.
In this case by the time this player has made those 6 golds using the trade up system they have already paid more than the 50 k cost of the crafting system. That’s the math I found.
Now I also think it is important to think about how long exactly all those irons, bronzes, silvers, and golds sat in a players inventory before they were eventually traded up. How much time was actually spent hitting that trade up button over and over again. How in the end you traded up a big load of cards you are not keeping as well as spending credits per trade up just to get 1 card in the Trade up system. What are really the differences between the two systems?
I am not trying to be rude here to any one. I am honestly trying to just understand where people are coming from. 
Also using a similar formula
Trade up for 4 silvers: 8 k + 8 k + 6 k = 22 k which is less than 25 k the cost of making a gold in the crafting system. The main thing to keep in mind about this is that what really are the chances a player is going to have half the bronzes and irons already available.
Trade up for 4 bronzes: 4 k + 3 k = 7 k which is more than the 5 k the cost of making a Silver in the crafting system.
