I didn't anyway dispute that jackpot is not about luck, if you read my statement correctly you would see that I still mentioned about luck over there. Like I know whatever that leads you to put money for the intention of receiving something higher as gambling solely rely on luck, and luck is the determining factor in gambling provided it's stake with money to have a chance of receiving double or folds in return need luck.
I understood your point from the very beginning of this conversation and, agreed with you on the rule and place of luck in gambling, in fact gambling is all about luck and all of us know that, in as much as we try to apply some basic techniques while gambling, we still rely 100% on luck, so you are right and expected to have mentioned it in your comments just as you did already so nothing wrong with your statement and I am not contradicting things either.
But in some situations when you have a long bet on a single slip and your other games have been won already, why not apply cash out and avoid all such tension that comes from the last game on the slip, because such last game has been what has denied us any form of luck at the end of the game goes against our prediction we lose everything, so why risking your luck.