There should be more possibilities with the entry fees.

1. Paid by crystals
2. Paid by gold
3. Free (content of entry packs can't be retained)

Depending on what fee is beeing paid there should be fitting prizes. E.g. it is no incentive for me to win crystals or gold. So why should I pay an fee. I've also got every card already I need so the content of the packs are also no incentive (exception possible foils).

I would prefer free fees for those people which like to play 'just for fun' and would like to use the automated tournament feature for having an easier and faster setup than organize it manually through e. g. telegram and challonge.