No, not scammers. Just very bad at math, and therefore unreliable. Good thing I've been cautious and got out of the mining crap way before the storm hit.
The true scammers are the bastards on the offer walls, with their utterly broken sites that want to collect every info about you and too often give nothing in return.
Oh yes they are thieves. Programmers who can build such a site, are NOT bad in math. I am programmer myself and I know. If they have ran this site like normal HYIP, this would be running years from now. Normal practice is to take 2-3% of turnover and let the site run as long as it gets new users and cointiply was getting 1000 new miners every day. But they wanted steal millions, they are rich now and lol.
Of course offer wall offerers are thieves and spies too, but these are same gang. Find them!