I've seen a couple on the net with a sign like yours. Seems the payout listed on the signs varied based on the which coins the machine is set up for. This dollar machine paid $200 for the horseshoe jackpot and there's a 50 cent machine that paid $100. What denomination goes with your sign? Maybe you need my machine to go under your sign!
Mine appears to have had a sign at one point. I've wondered if it advertised that you only needed 2 bars for a jackpot or if nothing about that was mentioned so people would think the machine was broken and therefore kept playing it. Funny though, I think the machine's average percentage take was higher when only 2 bars were needed.