Make easier money, or if you have spare money, waste it. And maybe challenge another player to a duel, or something. Please, critisize.
I kinda like the idea of a place where you can dual because I like fighting other players. However, if the dual mode was based off of hp, then great swords would have a huge disadvantage because they are too slow and by the time they land a hit, a sns user could have them at 1/4 hp (no offense to great sword users). If the dual mode was based on knocking a player out of a ring however, then the disadvantages would be flipped around. Don't expect to see a dual mode coming up. As for betting, that could be a bit more reasonable.