Is it worth it to gamble without thinking?
Yes, if money is not involved. But if the motive of the gambling is to earn money, then it's not worth it to gamble without money. However, the beauty of gambling is the money itself, and the industry would not have been this thriving if not for the money involved.
And for you, when does the risk start to no longer be worth it?
When I have a losing streak, but continue to take emotional risks.