So I played a game with Nomad Camp / Fool's Gold, but no trashing or Warehouse-style filtering or whatever. In a situation like that, I feel like you have to buy Fool's Gold, since if your opponent gets all ten they'll probably dominate and can do it pretty fast; but a 5/5 Fool's Gold split (which is what we got) leaves neither deck with enough to be able to line them up reliably. So—once the Fool's Gold stack is empty, you've got a pretty weak deck. I spent a while not buying Silver after that, since I didn't want to further reduce the probability of my Fool's Golds lining up, but should I have given it up as a lost cause and started buying Silver immediately to pivot into, say, an Oracle/Big-Money deck? (Actually, what I probably should have pivoted into was Nomad Camp / Silk Road, but that won't always be on the board.)
This is actually an actual example of the Prisoner's Dilemma in Dominion: if neither of us buys Fool's Gold, we'll both have better decks than if both of us buy Fool's Gold; but if one buys Fool's Gold and the other doesn't it's very powerful. Or am I wrong about the value of even ten Fool's Golds in an untrimmed deck?