Nobody says that all complaints are made by one person (every casino has some kind of complaints), but it's hard not to notice that there is a way of similarity between many (I think that even most) of them.
The fact that they appear here almost every day is simply an illusion, because someone has created a dozen of these accounts and use different one for each day of week. Check that each of them has the same complaint text in the history of posts and often over 30 - 40 same posts in history.
So one person created so many accounts and then decided to make different deposits on 1xbit very well knowing that they are scammers. Then once their money got stolen they decided to create several bitcointalk account complaining about their different accounts getting locked up. Wow, this has to be the most delusional excuse I have seen this year so far.
This is not an excuse, but my observation, which you would probably notice as well if you will follow this thread closely for several months.
If someone gets caught but manages to cheat the casino several times before, he just open a new account and keep trying.
Hopefully 1xbit will improve security and eliminate such attempts, so that will stop paying off for scammers.