You got it right, these were the days that bronze is still profitable even without collection power. The picture above shows one of my daily quest rewards in bronze 3 using a "Quest Potion" that was still obtainable at that time using credits. I still cannot believe that on my right mind I've sold 10 Kretch Tallevor at that time for 3 dollars each. I underestimated the power of the card at that time that I'd sold each and everyone of them at a low prize because as a newbie in the game I thought that it will never end giving such a wonderful card. And then the developers started changing the bronze league to a nearly non profitable league in the game. Bronze is not a fun league anymore to stay with. You need to invest more now to earn more. Nowadays, Kretch Tallevor is now ranging 7 to 8 dollars each and still one of the talked about epic summoner meta in the game.
My overall conclusion is that, you'll never know what's gonna happen to an NFT game; there is always a plot twist in it. And that makes it more exciting to play with.