This is basically an assumption and it doesn't make any sense when you tried to compare gambling and trading as same. Gambling does not requires a skill for you to get it right ...
I have being trading and also gambling, all in a responsible manner as I can and I do agree that trading requires much skills and strategy to earn a profiting trade. Though I do disagree with you that gambling entirely doesn't require skills to make yourself profit, not all requires skills for with your luck you're good to go but in sport betting you have to knowledgeable about the sports you're of interest in and with your knowledge you don't get to gamble blindly.
Trading is majorly based on luck and we should not forget about luck have been helping making gamblers to hit jackpot without full awareness they could gamble and make huge winnings. There are some bets that requires a lot to skills like poker and other related ones. Games like slots majorly relies in luck for you to keep making profits and when you don't have adequate luck to bring winnings for you, then you might end up struggling to make profits trying to bet frequently.