I don't think the price of bitcoin has anything to do with the desire to lose money from players. Because gamblers and traders are two completely different classes of people who want to get money and traders know how to manage risks, but gamblers don't.
The last part of your statement is completely wrong. The ability to manage risks adequately, whether a trader or a gambler is 100% dependent on the individual involved. There are gamblers, responsible gamblers who knows exactly just how to manage risks when gambling, just as their are traders who have very poor risk management, so the assertion that gamblers do not know how to manage risks and trader's know how to manage risks is completely wrong.