if there not using any potions then tha means there not buying any packs ever and just take out of the ecosystem and never put in ...

That's just nonsense.

I already bought cards here when most players of nowadays didn't even know that Splinterlands exists at all.
I bought lots of packs.
Nowadays I buy assets solely in the market as my decks are build from pure gold foil cards only where it would be counterproductive to buy packs.

And yes, of course, I take out some of my winnings (after I put in more money than you will do in your whole life). :)