//Didn't you just hate those wizards who stayed on there for hours because of them.//
No, because I was one of them!
A friend and I would play "World Fair" in a local cafe for hours. The proprietor used to think we were piling money in all day long but in fact it was rare for us to need more than one sixpence to remain playing. You would get a reply if you exceeded a certain score (1,500 I think) but more lucrative were the "Special when lit" targets. It was easy to get three or four replays from a single game. The problem was the reply meter only went up to 15, so that was the most you could keep in hand.