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It is a sad fact but it is real that the number of participants of slot contest in this forum is not that much, I participated most of them and most of the time there were less than 10 competitors.
Well it seems that when those type of contest was ran frequently, most people got bored with it hence the participants of contest was pretty much always the same player over and over again.
To be honest I have no idea why it is happened most of the time, but it seems that most active members in this gambling board are not real gamblers.
Yeah ofc and this is one of the main reason as well but if Flush.com wish to run an exclusive bitcointalk contest then they had to start somewhere so yeah throwing a contest based on slots is probably the only option right now because they havent launch their original house game yet