That's my rule too. Even if I haven't seen/read the material in a few years, if I own it (and can locate it!), I signed up for it. The ones I'm praying for are beloved favorites that I haven't seen/read in a while and want the excuse to do so again.

That said, I didn't sign up for a fandom if a previous Yuletide story knocked my socks off. If you can count on your fingers the number of Ferris Bueller fics out there, why would anyone want to compete with "Skip"? I figure one of the benefits to Yuletide is that you can help define a non-existent fandom; if I'm going to do that, I don't want my story looking pathetic in comparison to somebody else's masterpiece.