That's what I did with this year's Archives. I got all the base cards no problem. But I've also collected all the Fan Favorite Autographs. This year there was just one Cub to get, Kyle Schwarber. Unfortunately, it was a redemption auto, and that's why I think I forgot about it. I figured I'd wait until the cards were signed and started showing up on Ebay.
I totally forgot about the card until a couple weeks ago. I'm not sure what I was searching for, but I came upon the Schwarber card--and had one of those "oh, yeah" moments.
Waiting until the Cubs won the World Series and Schwarber was a prominent figure in the series was not good for my wallet. The card was not as cheap as most of the Fan Favorites from previous year. But if I'm going to be a completist, then I have to pay the price.
Money well spent..and a forgotten hole filled...win, win.