Chants,supernatural beliefs or actions needed to be done first is something not really relevant because luck isn't something that could really be affected out by these things.
There are just people who do really believe much that these things could majorly affect on what they've been doing specially on dealing with gambling.
Slots is pure luck ones and considering the HE then you would likely to lose but if you are lucky enough then you could make profits.
You are right, however the article is very interesting because it suggests that many people here in the forum are not skeptical about these things of beliefs, as I said before, I know many who do raffles for cars, houses and go where people who supposedly does things with spirits and tobaccos asking them not to allow the winning number to come out so that they continue to make more profits, but based on what you say, this is apart from luck, taking into account a random factor, and really slots like that Since you can lose, you can also have that unique luck factor to give a good profit, those that are sometimes published on some platforms that are millionaire profits.
Obviously it is their own right to do so, but it would be nice if they can share it here in this thread. 
