In most parts of US, any payout of more than $1,200 is paid in person by the slot floor person. The tipping here starts with a minimum amount of $20 and can be up between 3-10 percent of the jackpot reward. It, however, depends on the discretion of the customer.
I think that it will depend on where you are playing in the casino. This may be different from one casino to another, from country to country, will be different. This tipping maybe also like giving tips in restaurants or other places. Sometimes, because the culture and habit, tipping becomes one thing that must be done and it has been likely determined in several percentages. Like what I read from this article:https://www.liveabout.com/tipping-guide-for-slot-players-536668#
But, if that is in the common casino where tipping is not necessarily determined, it may depend on yourself whether you are going to give any tup or not when you are winning. Some people may think that giving tips after winning becomes one of the things they only give gifts to the casino workers. But if you don't win any slot or whatever in the casino, moreover you are lost, I don't think that it is not necessarily tipping them. I am sure that the casino workers understand this. But if you are winning moreover winning the jackpot and you don't give them tip, this may make them hate you inside, although they are not showing really on their face.
