Upload & Sell: Off
I loan out cards likes crazy, people "lose" them and I end up replacing them with whatever the best SanDisk 8GB priced around $30 is when I stumble into Best Buy once or twice a year. I used 30MB/sec during all of 2010 with my D90 and eventually D7000 (both slots), then 45MB/sec with 30 MB/sec backup from early 2011to a little after Thanksgiving when I bought 90MB/sec and moved the 45MB/sec to back. So now both my D7000's have 90MB with 45MB back, but whenever I stop into somewhere that has SanDisk cards next they'll probably have 120MB/sec ones or something for an absurdly low price and might grab them if I feel like standing in line.
I just bought 10 sheets of 4x5 film for $30 that will last me a few weeks at most, so I don't mind keeping my digital film that will last me 8-10 months of primary use and another 8-10 as a backup up to date when it costs the same. I do swap my cards a lot though, constantly in and out of my camera and Mac, so refreshing my cards is probably a good thing.