Most people fails to understand a thing talking about basic income: it's not for those who get the money but for those who get them from those who get in the first place.

Yes, poor tend to be unable to retain money, they spend. Spending means someone else get money from them. So those with a basic income can spend more, making local economy a bit better and still making their life a bit better.

Remember a neglect thing: money are unit of measure of various substrate, not a value per se. Exchanging money means moving something else.