There’s a lot of evidence to show Watchtower made money from publishing. We’ve even got some of the financial planning documents and internal letters. Not to mention the physical evidence of the books themselves and how the quality was reduced after charges were stopped.
I don't know any evidence of any kind that Watchtower has benefitted financially from blood doctrine or literacy programmes. When you say they invested, do you mean when congregations bought cell saver machines for hospitals? I think that got them (or so they imagined) good publicity. I don’t see how they made any money from it.