Do not compare the trader and gamblers i know and we all knows the difference between of them, same has have risk, but trading is a serous job to earn profits in the clean way, not unlike for the gambling is not the source of earning for is only the game of fears.
Gambling can be a source of income for those that play games that are not only about luck but about skill as well, sports betting is probably the most common way in which professional gamblers can make money, but you are right we cannot compare trading with gambling since in trading you can pick the market conditions in which you will participate while that is impossible with gambling.
true, sportsbetting is like more on need skill than luck because it is almost like trading, if trading we analyze chart, in sportsbetting we analyze both team that play on match. but we can't compared trading and gambling because of 100% loss in gambling wouldn't happen in trading
Those that bet on sports use similar techniques like those that trade, an example is hedging, you can hedge your bets in sports the same way you can hedge your trades to avoid losses or to lock your profits just in case, but unfortunately many of those that trade treat it as a form of gambling and that is why we see so many stories of people losing their money.