I'm surprised neither Lost Arts nor Pathfinding beat Grand Market. I suppose that Grand Market is never, ever not a great card, whereas I can imagine there are kingdoms where neither Pathfinding nor Lost Arts shine (either because you're already close to drawing and playing your whole deck, or your card distribution is very spread out), but I still think in the majority of cases you'd much rather spend $6 giving actions to three, four or five cards in your deck, or spending $8 to turn three, four of five cantrips in your deck into Laboratory+ cards compared to buying a single cantrip that gives you $2 and a buy. But I guess that comparison is only fair if you're only planning on buying one Grand Market, which is never the case.