Although you have a valid point if we look at it from betting perspective but sometimes we bet just to have FUN and not the profits.
I do it sometimes just to see if I win the bet and ignore the odds. In such cases we can bet with extremely small amounts which are obviously affordable to lose.
It's common for many to gamble because they want to have fun, not winning is the main target, but if we have to throw away the satoshi we earn just to have fun without any chance of winning the bet, I will choose to save it more because we don't know what is the value of the satoshi in the future which will certainly be more valuable than today.
I would say the opposite, and we can see it in the forum. For most people, the possibility of earning money is the main motive that drives them to gambling, with entertainment being a secondary factor. Those of us who seek entertainment because we are aware that it is a long term losing game, even if we sometimes come out with extra money, are in the minority. If we were in the majority, casinos would not be so profitable and there would not be so much movement on the forum in this section and with the gambling signature campaigns.