Gambling has never been and never will be good. Simple thing: Someone has to lose to someone else could win. You will win once, but then you lose a lot more. Ordinary mathematics .. nothing more ..
Have you even read the OP? He is asking about
investing in gambling sites, not playing.
Generally, you won't lose money. There was a scam site called dicebitco.in, and they scammed house's 500 btc fund with cheating. So you need to invest on reliable site.
It's a theory, that the highly profitable investment or double the money and would not eliminate the money. That is certainly true, but if we are not smart in choosing investment then something negative things will happen to you in the future, as you say friends. That investment must be in need of a clear track record, so that we do not become a victim of fraud
Yes, but the thing is that anybody can run away at any certain time; dicebitco,in was pretty trusted at the time as well. You just have to put faith in the owner really, nothing more. Most gambling sites have more to gain by staying than by running.