1. You have priors for similar offences
2. The writing style and words fit your M.O.
3. You have the motive-free beer
I was laughing when I first saw it, I had this visual of all these sellers and realtors scanning the competition and seeing that ad, then having panic attacks and thinking that is why nobody is buying their house. Little do they know the mastermind of the evil plot has one motive, to win a bet over free beer. It has a Dan Akroyd/Eddie Murphy Trading Places feel to it.
I spent a chunk of my youth living in a fraternity house and I learned to never underestimate the creativity of a man when free beer is on the line.