Well just a thought here but if you buy two and keep one sealed, people will pay a much higher price when they become rare for the sealed one.
Sometimes the collectable price for the sealed one when sold could pay for the original...
Although most collectors will probably not sell the sealed one and just horde it.
A lot of Japanese collectors even keep the registartion cards, warranty leaflet, promotional inserts and the spine card that falls out when you rip the cellophane off!
:-)