If a buyer prefers to receive his/her watch sealed, whether for the pleasure of placing first fingerprints, for later unveiling, or for permanent storage, that decision is his/hers alone. The "problem" is being mis-attributed to some silly plastic wrap or ugly purple box, as if eliminating one or both is going to end or alter the purchase patterns of buyers willing to pay a premium for certain pieces. I suggest the "problem" isn't a problem at all. This buying and selling isn't going anywhere. Demand exceeds supply, short supply pieces command higher resale prices, collectors and "flippers" to varying degrees capitalize.
Participation isn't mandatory. I've never sold a watch and I've never paid above retail in the aftermarket for a piece. My choice. Sure, I've missed out on references here and there that may have landed in flippers hands, but I can live with that. The free, semi-liquid market they help establish and maintain is of value to all of us: a current market wherein perceived value is determined by two parties in agreement. A market without plastic wrap and cardboard boxes won't behave any differently. Nor will opportunistic flippers, collectors-turned-sellers, or buyers with the resources and desire to purchase sought after pieces at above-retail prices.