If you look only 1 person buys a ton of tickets and wins every time.
This is interesting. Three weeks ago on the btc-raffle thread, there was a discussion that one could have many different accounts and have bought a huge number of raffle tickets. Some people thought it would be unfair. I disagreed and explained it is kind of like playing a 98% dice bet that no matter how many tickets in a raffle you have, it is never a guaranteed win (
https://bitcointalk.org/index.php?topic=1288600.msg13257007#msg13257007), and "btc-raffle.com" agreed with me. Why do you suddenly think it is a big problem now, especially when Pevpot is provably fair?