Both things are risky and should not be considered to do or invest on these things because you are just wasting your money. Somehow on gambling you could lose your money on but you do gain entertainment and you could able to stop anytime when you see that you are losing up too much unlike on hyip which you cant get back your money if you already putted into the site.
What you are saying that don't also invest in gambling sites, bankroll casino's? You gotta kidding me, bankroll casino's are more reliable and legit to hyips.
It is true that we must not get considered those hyip's but saying that we must also not to consider bankroll casino's, I totally disagree.
Many of good gambling sites giving the chance to the investors to invest with them ,just like bitvest.