The words original price mean nothing to me, as it should to everyone. I ignore discounts too, I only care about how much money is coming out of my pocket for what I'm paying for, and what my alternatives are.
I lie about discounts all the time, all salespeople have to. Buying a house, car, land, businesses, etc. People in poorer countries where bartering is common do it for everyday items too like fruits and vegetables. They'll say "I'll make a deal for you I don't make for anyone else."...obviously they make it for others too, but is the buyer supposed to take it to heart? No, it's all in the game.
If the retailer says 70% off the rolling average sale price during the past 365 days, and then lies about THAT, I would feel cheated.