This is the best thing ever. Not only is your analysis on a par with rocket science but your graphs are beautiful and explanatory, too. Plus, you've made some great discoveries.
I am with SarahDB, who says it is okay to have slightly more sandals that your climate might strictly warrant. We change out sandals more often, and they are more delicate, as she says. (I really like the one in your Finds! I'd love a pair of those.)
The other reason this is the best thing ever is that Angie chimed in to say she has about half the number of shoes you do, and is not a "shoe person."
Well, I also have about half the number you do, and I am a shoe person, as I've already confessed.
In other words, your analysis has just given me permission to go shoe shopping!!