As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.
[Please read the OP before voting. Special voting rules apply.]
Buying a lottery ticket every now and then is not irrational. Unless you have thoroughly optimized the conversion of every dollar you own into utility-yielding investments and expenses, the exposure to large positive tail risk netted by spending a few dollars on lottery tickets can still be rational.
Phrased another way, when you buy a lottery ticket you aren't buying an investment, you're buying a possibility that is not available otherwise.
I'd agree that if a lottery ticket and a chocolate bar give you the same hedons and no other options are available, you are better off buying a piece of paper than an unhealthy snack.