It&#x27;s not only the odds but the magnitude of the bet that matter.  Because losing $1000 wouldn&#x27;t bother you much, you&#x27;re happy to do it.  But scale the proposition up enough, perhaps 10^3, and you wouldn&#x27;t be so relaxed about it.  E.g. 1-in-a-million chance of winning $10 trillion, but it costs $1 million to play.