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I find it interesting when people "worry" about what others are spending/losing on poker. Do you worry if your neighbor or friend buys a new car, or tickets to the game, or golf lessons, etc.? They are all individual choices.

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To some extent I can agree with your post, in one sense there is something simular between spending money on gambling and on other things like a new car.
But I think that if I sold the car to the neighbour, I might worry about if he could afford it or not. And even more so if I suspected that he might be addicted to shopping.