[These findings are] not surprising, since many of them don’t win much, and lottery enthusiasts tend to be poor.

You can easily extrapolate this further to say that they have little ‘financial know-how’ and thus, as you say, are “least able to make wise decisions about money”.

The fact that the lottery is so widely played here in the UK is a fact that saddens me.

While it’s nice to believe that lottery winners are destined for a financial rollercoaster ride, the sad truth is that people who have the poor financial sense to gamble in the first place are those least able to make wise decisions about money.