A few days ago I bought 200 crystals for €3,39. Today I wanted to buy 300 crystals but they cost €10 now.
In my opinion is too expensive, because almost nobody play in this game.

All the time I'm waiting 1-3 hours for any game, so even I can't use my premium account.
Maybe you will set price as was before until more people will start to play in Panzar?

the amount of pay depends on method of payment

and this server is kinda new so if you are lets say 10+lvl i dont think there are many players that high yet, but i might be wrong :/