if you are going to do a lotto, you better find some transparent way of picking the winner.
One way to do it...
say ticket prize is 100 000 gold
Put up stones for sale at
100 000 , 100 001 ,100 002, 100 003 ... etc
To enter, buy the stone from you. No pledging / trying to collect and so on..
To decide the winner find a public source of "random" number, middledigit from the volume or value traded of Apple shares on a certain date , the last digit in the first ball drawns in an offical lottery.
The timestamp on a forumpost(last digit second).
Then like the mob you could have a nice racket going, running the numbers.
A hatdrawing lotto is hard to get going for "serious" virtual gold, trust issues.
good luck