If every Gambler comes with the intention of enjoying the moment then there will be no feature and any gambling site like at Auto bet so it implies that many people coming with the purpose of making money e so they are just setting up auto bits with the desired value.
Truely speaking, everyone is having that "Lets make some money" idea in the back of their minds when they gamble. But if someone asks them then in order to not look bad in front of them, they would say that are playing for fun. Honesty is often hidden here because of the dear of being judged and that their family members would not like that.
I agree with you there is an imminent red streak and it can happen anytime and some of them are very long sometimes as long as 12 to 15, so you need enough funds to cover a long streak of losing, this is one of the reasons why only high rollers managed to catch a win in a martingale strategy.
But a martingale does not necessary mean that you will win, you dont have an infinite bankroll and a unlimited max bet outcome in real life. So that hope that you will get a green after so many bets is false and people should learn this.