Deleted User - 1759805
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You forgot that you can win ribbons in presents on every card. With that, you don't need nearly as much. If you complete regular quests after a week you will end up with about 5200 ribbons or so (picking up ribbons from the city + 100 from newsletter, but that's it). According to my simulation, this should be enough for 16 grand prizes, meaning you're just 20 bricks short, or 10 hammers on average. Number of people spent their ribbons after completing the regular section, and got 16-17 GPs (e.g. see @m4rt1n's post above).I suppose it depends on if you consider 133 bonus quests to be a couple extra...
To hit 17 GPs on average, one needs slightly less than 5600 ribbons as an input, which can be done just picking up ribbons from the city after completing regular quests.
Now, on average doesn't mean guaranteed, so certainly some people will need bonus quests to hit 17 GPs. But then again some are able to do that even without finishing regular quests (again, see above).