Which has literally nothing to do with the "dollars per homeless person spent"
Think about it, if there was a threshold and somehow spending $1 more per year reduced the number of homeless by 50%, that metric would get worse.
It's fine to make the argument that the outcomes are bad but it's lazy and ignorant to divide two unrelated numbers and declare yourself outraged.
Spend some time working with the thousands of underpaid and overworked social/case workers and volunteers in SF if only to get a sense of the scale of the problem.