I agree. Some people have lost money. Any time a stock turns down, it's safe to say that somebody is losing money.
All I trade is the OTC, so I know it is dangerous out there.
Just keep a few rules in mind-- buy when the stock is low...not when it's on the run because (especially in a P&D) you never know when the end of the run is near. Use charts to find logical entrance and exit points. Then sell when you have a profit.... don't marry the stock. The stock won't love you as much as you love it...and that's coming from somebody who has lost a lot of money trading pinkies :-)