I'd agree with Turf and everyone else that the buy and hold strategy won't work for video games in general, these aren't fine wines after all and retro-gaming has a considerable 'fad' taint at the minute. That's not to say that retrogaming is going to go away, or that those who collect or play for the love of it are going to disappear, but for obscure, niche titles like this, there's going to be a very limited number of people interested in owning a copy, the value's probably not going to keep spiking.