Entering a free tourney mean you spent time to reach the required level to get it for free...
Putting a 10dec fee seems more to be a way to reduce dev's cost as it raises a barrier to players who failed to wqin previous tourneys and eventually ran out of dec...

And this after you made trucks load of money with untamed baking campagin where you told us you would continue to bring great tourneys for your player base...

NOT sure I appreciate this

Do not speak about how tiny the fee is, you can run out of them, which make a barrier for the players.