Dont waste your time on +reources. That is a short term only investment that is almost useless once your garrison is running. To start, you really only need 4-6 followers with treasure hunter. You usually get 100g and a 60-75g mission, the rest are 25-50 and only 1-2 followers, so the scaling stinks. Rarely do i get a 125-200g, and blingtonrs vault only shows up about once every 2 weeks for me.
I think its still worth it to get going. I make 100-150k gold a month doing nothing but garrisons missions and selling stuff from on the ah from the missions rewards or salvage yard. It cost me a lot less than that to get 5 garrisons going. Youll be making good money in 6-8 weeks.
edit: I need to look at my accountant, but I bet that 30-40% of my gold came form selling mission rewards, maybe more. Those honor tokens sold for 10k each and I sold a lot of those.