Are HIYPS reliable?

That's why it is called High Yield Investment because high yield means high risk therefore there is a bigger risk involved in this kind of investment. You will never know when a HYIP goes out of business. The best advice is to never invest more than you could afford to lose and just use the spare money you have to avoid being bankrupt. There are still things you can do to avoid losing a lot in this kind of investment and that includes doing a lot of research. Personally, I won't focus more on HYIP since it is very risky.