Just printing this item was reported in the article as costing $150.

How much might it cost to have someone local show up and produce a decent-looking chalkboard display?

This is what people are actually mad about when businesses use AI art. You claim to live in an artistic community, great, ask your staff if they have any friends who draw who want to come by and make a quick $100. You spent more money on a worse result that alienates your community.