It does, if one wanted to take their chance to hit a good amount of winnings.  It makes sense when a person wanted to make his $20 bankroll into a $200 bankroll.  It is the same as taking chances in a job interview to be hired.

So if for you it does not make sense, then it also does not make sense for you those actions where people are taking their chance to get a job?

Aside from these chances, for those who wanted to have entertainment through gambling, it does make sense for them since they find entertainment at a cost of their bankroll.  Just like people watching movies, hiking and other kind of leisure where people spend money to be entertained.