How Long to Keep QSL Cards?

I am in the process of moving the home QTH to another location here in the city. Noted previously is the fact that even if I put up an antenna at the new location, 3/4 of the signal will be going directly into dirt. There are many good reasons for this house and the location that I won't go into here. And, as noted before, I'm in the process of re-designing how I do my ham radio hobby.

But, moving in only 11 more days, I've been staring at all the radio stuff I have and wondering what I should keep and what I should sell...and what I should throw.

I saw a post on an e-mail reflector earlier today that has me thinking...why keep six boxes of QSL cards that I've accumulated over the years? It is pure weight and storage space and I haven't looked through them since I moved to the Pacific Northwest 3+ years ago. I'm not chasing awards any more. I have a hard enough time answering the QSL cards as it stands.

How long do you keep your cards?

Scot, K9JY