Most especially when we are talking about gambling games that generate number randomly, eg are games like dice, poker, aviator, football virtual games etc. all these games uses random number generation system to produce results, that we gamble in, so they are all based on luck.
For games like this we all know we don’t know how those numbers are been generated so all we can depend on is luck and nothing more than that, this one’s don’t even require someone to have skill in other to win the game as I have played slot and aviator countless times even when I tried to master and learn how to use a tactic to win it all lead to no where.
while the remaining 30% can be exercised in sport betting. One can use the knowledge he has on their head to head to make prediction, and other factors like players resent in the match. Though most times the result tends to drift away from our prediction.
For sport betting I think the winning percentage is much more than the 30% you rate it on, we seriously need skill to win those. As we have to analyze the game and pick out our options and 30% to me is not enough to guarantee our winning I can say it could be 50/50 luck with skill or less I said this because even with the skill we still need luck to win but the skills are not totally useless.