I don't think a 'booby trap' is neccesary, that seems a bit too much. A simple login system could have prevented this.
Well, in hindsight preventing any hack is simple. But game engines usually show hundreds or thousands of cases of undesired behavior. IIRC a lot of public Minecraft servers have given up on trying to secure anything but identification -- with varying results -- and fight cheaters using booby traps and manual bans.
I admit I don't know how much money clients of BitVegas put in. But if it is to become anything like other gambling places the problem becomes incomparably harder than keeping "normal" Minecraft servers safe.
Minecraft servers have been repeatedly hacked and exploited in the most ridiculous manners, with no money involved, just for the lulz. It was clearly not designed with security in mind -- if BitVegas becomes successful, it also becomes the premier target of all future Minecraft hacks. As soon as there's enough money around there will be no warning period, all "zero day" exploits would strike BitVegas first.
Oh well, I guess I'm getting a bit off topic here. Anyway, good luck with keeping things safe.
Yes, this is quite worrysome. I have a small server myself which stores BTC, and the problem is with hosting it on Minecraft, you have no control over the updates, and possible bugs or exploits that come with it. But if secured well I assume it wouldn't happen again. Bitvegas wouldn't be the same if it was a website, what makes it unique is that it is a casino in Minecraft.