I'm assuming this would have hung in a Best Buy, Circuit City, or some other electronics store. Googling didn't provide me with any information, except for the usual "hey I found this sign, does anybody know anything about it?" thread with no replies. Also, any idea on the value?
The value of store displays is hard to gauge. Like anything else, it comes down to what a potential buyer is willing to pay. The target market for something like this would be a collector who already has a large collection and a room to display his collection.
I think it's cool that the electric parts still work right twenty years later. I'm going to go out on a limb here and estimate that depending on condition, you could probably sell that sign for a range between $100 - $250. That's just an estimate really.
Going by what NintendoAge people were drooling over and paying on signs when I was over there a few years back I think you're under. Yes the overall size will hurt it, and definitely not being 'made by Nintendo' too as it's a general store display, but the value is there. It also cross values between Nintendo and Sony fans. Someone may not hang it, they maybe a fanboy of one and don't care/hate the other so that side will go up against a wall and get plugged in backed up on a shelf or hanging like a picture. Someone who may have both as an interest could wall hang it again, sticking out (or ceiling) as a divider between their groupings of games too.
Shipping will kick its ass to a point though, but if you set a decent value (if you sold it) and allowed to meet someone within X miles driving or they were close enough then you'd probably get more mitigating the postage fools damaging it and the heavy cost of having Fedex or UPS deal with it as that won't fit into a 70lb priority flat rate so the USPS will rob you blind on it.