Ran across this article from Twitter's Engineering Effectiveness group thinking about how big a team needs to be before dedicating a portion of that team to aiding the rest of the team pays for itself.
Not necessarily hard answers, but thought provoking content.
edit: I seem to have a hard time finding this article when I want to, so here's some extra keywords to try and help tag my own brain: engineer dedicated support developer happiness flowers thousands 1,000 999
