I mean after you used STEEM, how in the hell can you go back to Ethereum or Bitcoin. Its just too big of a pain.
I have one $30 dollar card on GU im trying to sell for 15 days now.
I place it to be the cheapest constantly by at least 20% and it just wont sell. I have never once waited for any card at the lowest price on SM more then 2 days to sell and i sold hundreds of them. The only ones that take time to sell are where you combined dozens of cards.

You cant really make a booming market when youre stuck at 30 minute cancellations. That slows the market tremendously and price discovery instead of taking 1 day will take probably up to a year.
Then ofc you just need the one card and the card being gold or diamond does nothing in GU. Its just a skin when golds offer tangible benefits in Steem Monsters, for one having a higher base BCX, then DEC gain is increased for golds.
All brilliant ideas.
Ive been looking at the GU player numbers and they are constantly falling every day. Each week they lose about 10 players on the same days while SM is growing consistently.

Ethereum sucks to use and it will hurt the game a lot.

But ok, ETH has NFTs and hard consensus, steem only has soft consensus. But do you really need that level of ownership? If GU shuts down your cards are instantly worthless regardless of your ownership. The game isnt really on the blockchain.

SM provides a "high enough" level of ownership while having STEEM as its base chain with all its benefits.
At the end of the day crypto users wont care about how much your game looks like Hearthstone or a AAA title, but they will care about ease of use and their consumer experience.