I see what youre saying about the street spar, but I don't know how this would would out :o...especially imagining say 20 people in one area trying to street spar each other, even with warps its a lot of obstruction
As for the bet spar, I love that  maybe there can be a special trade table where you place your bet items on, and winner takes all? |
How about you are warped to a level were this would not interfear with other players, once you finish you will be warped back to the same cordinates you were at.
But im thinking maybe a showdown would be better with a 1 hit ko guns only