usually you can see how many of the bigger prizes have been collected during a run. If you didn't manually ensure they were not all clumped together, you might

usually you can see how many of the bigger prizes have been collected during a run. If you didn't manually ensure they were not all clumped together, you might run into cases where tickets could be deduced to have substantially different odds (in either direction)... I think this has actually happened. You wouldn't want all the big prizes to get claimed right at the beginning, I imagine people would largely stop buying your tickets.