toylion
Super Freak
I think it add value to the piece. If you were to sell it and the light up didn't work any long it probably won't sell for as much. I don't really sell my figures, but knowing it had the feature and it works makes it a little more special. As far as the figure costing less if it didn't have, I don't believe they would. There are many Hot Toy figures that don't have it and still keep going up in price.