Moneylender, anyone?
When I first started playing Dominion, I would never use Moneylender because I didn't want to lose my Coppers for a short term boost. I hadn't yet occurred to me that, when you take into account the -1$ from trashing a Copper, Moneylender only gives you as much as Silver does, but costs an action.
Once you realize that, you think "Wait then, why would anyone ever get this card, unless...unless trashing Copper is a GOOD THING." Moneylender hints to the new player that even Copper is a junk card, much more so that Chapel does. If Copper is a card you don't want in your deck, then what does that mean for Estate and Curse?
Oh, if only I had caught on to that sooner.