Only person I have personally met that failed out due to flying, failed something like 12 or 14 flights including three check rides (the same check ride but he did it three times).
Bullshit. This is numerically impossible. If someone had failed that many flights they would be going to an FPC automatically for failing a check ride. If you fail that then you are done. There was a somewhat recent attrite that had the most I've seen and he had about half that many unsats. In reality it only takes 2-3 unsats to fail primary if they are back to back. Any more than that and they would have to be spaced out around the syllabus. There comes a point (well before 12-14 unsats) where the front office will seriously question if you are cut out for this line of work.
Study more, give bad advice less.