Curacao licences (which sadly seem to be virtually the only kind available to BTC operators) aren't worth the paper they are written on anyway.
BetBTC.co claim to have a Costa Rica license. Are they lying?
I haven't verified if they do have a license or not, but apeman's point is that those licenses don't really do anything. They are available to pretty much anyone, as long as you pay, and the regulatory body is pretty much useless if you have a problem with those sites/non-existent. Curacao licenses are also pretty much worthless.