Just figured it was worth mentioning for those who didn't notice, but plates are apparently worth 750gp apiece. I could SWEAR this wasn't the case during the beta, but post-release it seems like most (if not all) of the plates that are scattered around the world are now incredibly valuable - more valuable than bars of precious metal or gemstones, anyway.
It's odd, since they're one of those items that was apparently considered so trivial it doesn't even highlight when you hold down the Alt key. After making another sweep through the starting town, I picked up about ten grand worth of plates. Esmerelda alone has something like six in her house (totaling 4,500gp). :P