Q:

Can multiple Wii balance boards be used at the same time?

One online shop offers two Wii balance boards as a package, but I found information on wiki that two balance boards cannot be used at the same time.  
So, is there a reason why they offer two Wii balance boards in a package? Are there any multiplayer games for the Wii balance board? Can multiple Wii balance boards be used at the same time?

A:

There are currently no games supporting multiple Balance boards, and I don't expect there to be any, if only for the price of the devices, and the amount of space needed for such a setup.
All current games supporting multiplayer with a single balanceboard do so in a hot-seat style. (or should I say hot-board)
Technically, for as far as I can see, the Wii itself is perfectly capable of supporting multiple balance boards, but I don't know if this functionality is even availble for developpers

