was farming zins and remember how i was getting bored then playing W3, but it had nice feature, a card game called Gwent.
So why not to add to metin2 some small card game? Maybe similar to gwent or some other card game or at all some other mini game that you could play then bored of farming.
And how tec can make euros from that? Mini game would have limited time limit per day to play, etc 2 hours, and ofc card would be binded to char and to unbind them u had to buy unbind scroll from mall and so.
Could even feature some game tournament or event, could have ranks or something. Ofc i bet it hardly possible in metin, but still worth to think about