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Based on all of this, I can only conclude that if you want to run a clean business, don't give people free money! Some users will try to abuse the livin' shit out of it. There is no way to guarantee these people can be trusted. And free money is a drug like any other. They want more and they'll do anything to get it.
I agree with you, But, I would like to say to you, that Bitlucy really has issues with their payout system which has already been confirmed by Royse777 and Bitlucy. I don't believe all of them are abused the bonus. Even though there are a lot of newbies complaints about payouts, I believe only a few of them are legit accusations. Even if there are only single accusations, Bitlucy has to solve the issue On time. I hope they will do it. If those accusations come from newbies, That doesn't mean the accusation is not legit. One of the newbie's problems fixes earlier. See,
Although I understand what you mean, in these circumstances I find that their free bet promotion does not produce the desired outcome. One could even say quite the opposite. I would personally rather opt for some form of bitcointalk-exclusive promotion. It is much easier to prevent abuse if you limit the promotion to forum accounts only.