Well Tink I have A LOT to say about that, as you may imagine...when I spent 2 1/2 years in SF 1967-69, I never saw even one homeless person. I recall earning around $525 per month, and paying $50 rent for a nice little studio apartment (2018 equivalent would be $360 rent per month).
The Spur article did open on my computer, and I was interested in this, you already know I am questioning our economic/financial systems: 'Homelessness has always existed in the United States, but it has not been this prevalent since the Great Depression. In his 1944 State of the Union address, President Franklin Delano Roosevelt declared a “second bill of rights” that included “the right of every family to a decent home.” '
As for the low donations in rich regions, that has the case for a long time, maybe always? The Peace Pilgrim, who walked across the USA seven times beginning in 1953 McCarthy era, told about always receiving plentiful invitations for meals and shelter in poor neighborhoods, but not in rich ones. I have almost come to wonder if there might be something mentally wrong with many of the people who end up really wealthy...too much selfishness is not healthy!