HYIP can't be a real tool to growing our Bitcoin at all, simply because most of this sites are Ponzi schemes and most likely their admins are scammers and thiefs. There is some few exceptions of course, but in general its risky domain and you can lose all your Bitcoin in such sites
most of the time the Ponzi admins are not scammers or thiefs. Usually they just stop getting new people to invest and they don't have enough money to pay out anyone so the money just stops coming and they are stuck, site closes. Everyone should know the risks of joining them and stop calling them scams, they are working as intended
Either you are one of these hyip owners or... i don't know. Everyone knows exactly that such a system can't run for ages and when you know that and you end with some money earned while your investors lost money then you are a scammer, nothing more.
Now tell me that the hyip-owners end their scam and NOT earned money from it.
I only knew one person who tried to build a fair system like that. It was very open showing all incoming and outgoing transactions, nothing fake like it is normal, and yes, it stopped working. He paid back some of the whiners who claimed they were stupid enough to send them money they really need out of his own pocket. And that's it. No second try. But all normal hyip claim you get a certain percent and whatever.
Sorry but claiming these owners are victims of their own system is plain stupid. Or misleading when you are one of them.