I had 4 of the expansion decks for a couple of years that I never played because, lacking the base game, I didn't know how. Pretty frustrating since I couldn't find the base at a reasonable price anywhere. Lucky for me, while on a business trip to Portland, OR, I found a used copy (in perfect condition) at a store called Guardian Games for $18.
But I was lucky. I think the game deserves another print.
A side note: that game store was the coolest I have ever been in. Worth a visit if you're ever in Portland. They have a huge demo library, great staff and dozens of tables.