You called them poor and you still criticize them for not investing? I don't know what the word "poor" means in your own perspective but going by general definition of poor, you can not expect such people who hardly feed and shelter for themselves to take a risk in investment. You can not risk like them if you don't earn like them.
In as much as they are being persuaded and convinced to invest,it is meant to be understood that criticism cannot win them over to do the needful.
The approach to investment on the poor has to be understood as everyone out there falls into different circumstances...it isn't very easy for them to meet up to high standards.
So it is necessary for everyone to deal with issues amicably for a better society.