What Roger could also be talking about, besides re-using questions, is that if you were a daily watcher, they often had questions that would result in certain answers that were repeated.
In the early run, they had a few questions about "Dirty Dan", and quite frequently the panel would say "manure". Whether they anticipated that or not, they realized that "manure" would be THE answer no matter what when referring to Dirty Dan, and stopped writing those questions. I don't recall any questions about Dirty Dan after '73.
I remember a question that resulted in the same answer within the same WEEK, whether it was intentional or not. During MG 77, one of the questions was something like "The head of the firing squad said 'The condemned prisoner has been given one last request and we MUST honor it. During the execution, he wants us ALL to wear BLANKS" Of course, the definitive answer was BLINDFOLDS.
Later on that week, they had a similar question. "The condemned prisoner said 'My wife is WONDERFUL... for the execution later on today, she knitted me a BLANK." Again, the definitive answer was BLINDFOLD.
Of course, there were many questions that would get the response "tinkle" and "boobs". They stopped questions of that nature sometime in the '78 run. I'm not saying those questions were THAT frequent, but enough to be milked for the first 5 years.
Another thing, whenever there was a question about someone "losing his/her BLANK", quite frequently "virginity" or some variation of that was said.
Despite the repetitive nature of some of the questions, what made the show work was the strength of the panel and Gene.