I've been a victim of HYIP sites, Bitcoin doubler sites, but my worst experience was MyPayingAds. I put all my online money on to that company, I didn't realize that they are just a ponzi site because they require that you click 10 Ads per day and people's opinion about that site was really good. I thought in the long run, I'll have a lot of money rolling to my wallet but it turns out, they are just a ponzi site. Their Paypal account was froze and we had to wait. Their website was down. And then just a month or 2 months ago, they are back once again. With the same plan, same promises. Good thing I was able to dispute my transactions to them.
Now it's become very popular to hide HYIP's under revshare system names. It's like investment site and PTC hybrid. Mostly are based on Paidverts model, but Paidverts are alive already long time. But other sites are mostly HYIP's which works max two months.