Well last weeks net transnational revenue of 17,000 euro worked out at about .31 euro per 1 million BNK held.  So if we can generate revenues of 170,000 per week when cards are up then that's a not too shoddy 3 euro a week return.  @ $1,855 USD per 1million BNK, that would give you:
52*3 = 156 Euro per year so around an 8% return on investment over a year!  Far better then any bank is going to give you!