It just hit me last night that Lucky Seven could have been inspired by Bullseye '72. Both involve guessing the price of the car, and having "seven chances."
I can picture the conversation:
"So… we need a new car game. I have an idea… why don't we bring back Bullseye, only this time they guess the price one number at a time!"
"I don't follow…"
"Simple, we start with seven chances and eliminate one for every number they are away from their guess. As long as they have one chance left after the last number is revealed, they win!"
"That sounds awfully hard to win… just like Bullseye was."
"No trust me… it'll work. Let's rehearse it! Oh and we probably need to make some cosmetic changes so no one thinks we're bringing back an old game."
"Oh? Like what?"
"Well maybe we should start with making it seven dollars instead of seven chances, and the contestant will just
pay Bob for every number they're off."
"Um… ok…"
"Yeah, that'll be great! Also, I've been thinking… you know how we always have the prizes behind the door and the games on stage? Well let's shake things up… how about we put the game behind the door this time and have the prize out on stage!"
"………?"
"Trust me, it'll work!"