Here is another one: Seller is 2above-mediocre2. Look at the bid history you will see 1above_mediocre1 and queen_pin1. Notice queen_pin1 is selling signs that have the same background! Clear bid manipulation. Shouldn't be hard to explain to eBay!
This is nothing new. It's called, "shill" bidding and Ebay is perfectly aware of it along with the enormous fake sign market they're hosting. They will do nothing to stop it as evidenced by the mountains of posts/complains here and other places on the Internet.