If I remembered clearly, I found pretty much all lotteries in the past are somewhat pointless. For one, they get a lot of people to transfer their money to one person (In which is highly possible for a scam, and if not: ), pile it all up. After the limited amount of players are reached, they randomly generate who wins all the money spent on entrance fees. (again, they may scam at this point choosing their own alt who has participated and you'll never know)
Now what has this created? 2 highly possible scam opportunities along with no effort except creating a thread put into an event, lottery creators don't even have to spend their own money on their event.
And now, people will start thinking, oh wow, I can get to be known in the community by creating an event even without even spending my own cash; thus everyone create a lottery and a board gets spammed up with this particular event.