Anyone have an example of another MMO already using a lottery system for game rewards similar to what would be required for a housing lottery and can give details on how it works?

I wouldn't be certain that a housing lottery system would be an easy thing for them to create and implement even if it bears some similarities to loot rolls or Cactpot. There are also some major differences that players would expect.

Stop and think things through. Exactly how do you think the lottery system should work.

What's the entry fee supposed to be? Some think it should be the price of the house just to prove the player has the gil to purchase it.

Can it be canceled and refunded before a winner is chosen if the player changes their mind?

How long do players get to enter?

If there is more than one house available, can a player enter multiple lotteries at the same time?

How is the winner chosen? How long does the winner have to claim the house?

What happens if the winner doesn't claim the house? Do their forfeit their entry fee? Does a new lottery start or is the game supposed to pick a new winner from the other entrants? If it's the latter, do the other players have to continue waiting for a refund of their entry fees until the house is claimed in order to still have a chance to win?

What's to stop people from trolling the system or manipulating it to increase their chances of winning?