I may have misunderstood some of the comments earlier in this thread but the impression given is that people are able to submit their answers to this quiz, have them marked, be informed of any errors and then submit amended answers all before the deadline. Is that correct?
If so then that stinks. Surely the only reasonable way for a quiz setter to proceed is to refrain from making any comments about answers submitted until after the deadline has passed.
In addition it is surely counterproductive for any quiz setter to announce, before the deadline, that he/she has received a set of all correct answers. Any potential purchaser of the quiz who reads that information will know that to win the quiz they will need to get all the answers correct and then be lucky enough to be drawn out of a hat. So it will surely put some people off buying the quiz, ie the people whose main interest is in trying to win the prize. And there must be a lot of such people around - just witness the vast number of requests for answers to quiz questions on this forum and Answer Bank from people who give every impression of never wanting to submit any blank answers to any quiz.