Best Buy charges a 20% restocking fee on most high end electronics. That in itself would make me think twice before buying anything from them. I don't often return anything I buy but in the event I don't feel charging me 20% is necessary, especially if it goes back just as I received it.

I'm certain the bulk of the keyboards they'll carry will be low level PSR's and EXR's (as Diki mentioned), but they'll be forced to sell some higher end instruments in order to get the mid and low level lines. Yamaha is notorious for making dealers carry pretty much everything in their MI line, even if the dealer doesn't want it.

I'm sure if best buy wanted to carry Wersi that Wersi wouldn't even allow it. That would be dumbing down the brand by having unknowledgeable salesman attempt to sell a high end instrument. Even Guitar Center doesn't carry the Korg Oasys in most of its stores because they know the likelihood of anyone buying a $7K+ instrument is nearly non existent.

I'm certain Best Buy will sell tons of cheap keyboards, cheap guitars, and accessories. When it's cheap people just seem to buy it.