Interesting about the Mona Lisa and duplicators. I'd never run that thought experiment but I suspect you are right: the original might even increase in value, after suddenly being the "one and true original" among a sea of replicas.
I think in both of our cases, (PS1 game and motorcycle memorabilia) what people are ultimately paying for is the nostalgia. It's basically placebo: you are willing to pay whatever price is necessary to convince yourself to experience a nostalgic rush. In such cases, both originality, and high resource sacrifice/unobtainability, work positively to make this all believable.
How weird?