They have a habit of mixing small amounts of bitcoins but when you trust them and send large amounts, you get scammed right away. It sad that you got scammed even after warnings by other scammed members had already been put across.
Actually, most of these users only make research and inquiry about the legitimacy of a website only after they've sent their funds to it.
The best thing is whether at all the domain registerer or hosting are willing to take this websites down once they're proven scam, to prevent other people from falling victim.