Names and contact information.
Keep in mind that if I were clever enough to retrieve your data, I'm going to be clever enough to think to give AES_DECRYPT a try on it along with some others when it looks obscured, run salt with it, probably in this case both a static AND dynamic salt (stored on each record of the table)
True, but I wouldn't think it would be a completely fruitless exercise. It still would be another layer of security that would have to be broken.
Just because thieves can break into locked cars doesn't mean you should leave it unlocked.