Upload & Sell: Off
WPA/WPA2: More secure than WAP, but in the scheme of things, its still not secure.
It's not just WPA/WPA2 but all the other stuff that goes around it. Most routers are susceptible to any number of hacks and once the router has been compromised, then all bets are pretty much off.
steve126a, I think it mostly just depends on how paranoid you are, or how paranoid you want to be. In theory it's not just stealing your photos but also sabotaging your operations or even planting false evidence, etc. For instance, think of an area or venue that does not permit flash, if I want use flash I could commandeer the cameras of others around me (if we are all taking a photo of the same thing) to make them fire the flash while I took my photo. Then I get my photo (with flash), and they are the ones who get expelled from the venue for breaking the rules.
Also think of something like a sporting event that is covered by many competing photographers. I could interfere with my rivals, either by stealing their photos outright, or messing with their settings to try to sabotage their photos. If I had someone I wanted to get rid of on a more permanent basis, I could plant a photo or movie on his camera that made it look like he was involved in illegal or unseemly activities and then report him to the police, hoping they investigate farther.
Most of these things seem pretty far-fetched, but honestly, who knows. In data security I was taught to be paranoid, ie. NEVER use a wireless network unless it's necessary for the application, and to secure the appropriately and lock them out from areas where they can do actual damage.