Yeah I would definitely be putting a patch over the "1" and putting it right back up. I'd also add a line on there that says "guaranteed price or it's free".
Fair is fair right? :Big Laugh
I had a guy stick like 25 of these all over our small town, and he was from out of town. Every one they placed was illegally placed because of what our local laws allow us to do, so I emailed him and ripped him a new one telling him to play by the rules the rest of us play by if he's gonna advertise in my town. He told me that I was just jealous of his amazing business and that he made so much money he didn't care about laws.
I'm sure that's working out well for him.
Updated sign