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OK, but you think that's a good idea if a player earn in his first 100 fights 25 DEC everytime and afterwards maybe 0.1 DEC and this only in cases when he win the fight ?

Yes, because then he can buy a few cards to advance to silver, which can be done with just a couple of dollars. Level 3 Delwyin + lv3 commons = silver 3. Not like a newbie will know how to do this, but then there's the community he can ask.

Having some DEC also allows newbies to use the market a bit. It is obvious to us anymore, but when a new player first realizes the market is easy to use and not a scam, it is very relieving. The experience will also make it not feel risky to try learning how to get more DEC by having to trade for eth or steem first.