As a "home barista" I completely agree with you on your reasoning towards the ratios in HB vs. Coffee professional.
In Germany, good coffe from local specialty roasters often costs more than 15€ per 250g bag of coffee. I would say I have developed quite a good compass for what I like, but I'll have to start with something I know will sort of work. I I can get 15 shots from by bag, each shot is 1€ in coffe wholesale price alone....