Basically we don't know the risk in every site if you invest money in a site first is you don't know if the site was trusted there are site that can give you small profit but many site are just scamming people who invested.
i think it is more good if you have a trusted friend that are already invest in a site so you can asure that the site you want to invest are not scam.
As long as I invest in bitcoin, well, just a little disappointment from me. Maybe at that time I was investing in HYIP sites, but for now even with bitcoin store, I can benefit, so if you're great in terms of analysis, maybe very little risk you can accept.