If you see a user continually doing something wrong, let your regional coordinator know about it. They will take care of the problem. I am almost positive from using other gas price sites or apps that some station owners purposely enter incorrect (low) prices to get people to come there. By the time someone gets there and finds out the price is wrong, they may still get gas rather than drive somewhere else. And that is not for points, but for money. It definitely shouldn't be done, but I'm pretty sure it is done from evidence I've seen. We want to get rid of any problems like that as soon as we see them.
One thing to keep in mind about prices as well. Some users will confirm a price that they can see and not verify any other prices. For example, stopping to get gas at a station that keeps diesel on only certain pumps, a user may verify the prices of the main gas types, but won't bother going over to the diesel pumps to find out what that price is. It may be wrong, but because you are confirming all prices or none, the diesel is treated as if it's been confirmed. Another example is for people who verify prices as they drive past without stopping. They'll verify the prices that are shown on the large sign. If some prices aren't on the sign, their verification won't be complete, but will appear to be complete because it's an all or nothing setup. Maybe these aren't what you're seeing, or maybe they are. But if these are what you're seeing, then it probably has nothing to do with the points.
In any case, we do want to reward confirmations or people won't bother and then you have stations with confirmation dates of weeks or months (some stations rarely change their prices unless there is a significant increase or decrease in price). Although I would agree with having the reward be half the amount for updating the data. Of course, then you have the question... are these people just confirming the prices or are they entering the wrong prices. Changing the points won't help if they are entering prices that are wrong.