Same here. Both seemed to be pretty legitimate and professional-looking and their owners didn't seem to give off a scammy vibe. I doubt anyone could've predicted that both sites would end up the way they did. Also, I'm kind of on the fence as to whether or not Dicebitco.in was truly a scam (although if it wasn't one then it's obvious that they still messed up really bad).

I think the important lesson is that when it comes to dice sites and anything Bitcoin-related in general, trustworthiness and legitimacy are things that take time to grow and develop. Just-Dice is a legitimate site with a very good reputation and track record, and you have proven your trustworthiness by managing the site very well during the past several years. You could have done the same thing as countless other dice sites did by running off with your customers' coins, but you didn't. And that's what separates JD from the dozens of other clones out there. Unfortunately, ever since Just-Dice stopped accepting BTC investments, there has been a huge gaping hole in the market for a trustworthy dice site that accepts BTC investments and since all of the sites which attempted to fulfill this demand were new at the time, it was pretty much impossible to separate the good ones from the bad.