Because nexon and splash damage fail in a way to make this clear to everyone:
Silver, gold or cobalt is not better in any way. It is just cosmetic bling.
Beyond the bronze cards there isnt anything better gameplay wise.
You could discribe it like this: a cobalt, gold or silver card is a bronze card with another skin.
So if you were trying to get gold and silvers for your mercs because you think they are stronger or better, well you can stop now and focus on getting bronze;).
Getting anything beyond that is a waste of money and credits, because 95% of the time you’ll be trading perfectly good bronze load outs into 1 silver load out you will not like. (probably)
Untill skins are seperated from load outs and weapons, don’t waste your money or credits;) Or atleast that is my oppinion.