I think it would be much more honest if the witlesses were not so quick to judge others based on how much field circus they do. Suppose I sign up to pio-sneer (which I would not do). I find, in the middle of the month, that it is not going to be possible for me to actually make my time. What now? There is no graceful way to back down in the middle of the month. Rather, they are going to expect me to get my time in or die trying. This is quite likely the major reason people turn in fake time slips.
At the other end, you get those who don't want to be hounded. They know that they will be looked down on if they get less than 10 hours of field circus a month, and they can't reasonably do more than half that. The ones that Brother Hounder are looking at might be pressured to get "enough to keep the hounders off their backs", usually between 7 and 10 hours a month. And there are those who will supposedly favorably judge someone that is turning in times of 20+ hours a month, but they cannot get that many real hours in. The incentives for turning in fake time slips are obvious. Also, there is the obligatory one-hour a month to stay "active"--so, instead of simply turning in nothing (and getting a call from Brother Hounder), they will turn in a fake time slip.
I think the permanent solution to the problem of fake time slips is to make it worth it for the publishers to go out there. My rule of how much is enough remains unchanged: If you are going to get more benefit from the next unit of time you put in than what it is costing you, you should continue. At the point when the next unit of time is going to cost you more than you benefit, you should quit. If they want people putting in 200 real hours a month, they should make it so the cost doesn't exceed the real benefit until around 200 or 220 hours a month is reached. When the intersection between cost and benefit occurs at or below zero, you are asking for fake time slips.