A survey of 3,167 growth hackers with a combined marketing annual spend of +$500m USD highlights why marketing funnels fail. — funnel growth hacking — A new study by Growth Thinking found that 74% of growth marketing funnels do not make money — the Growth Funnel Performance Report analyzed 3,167 growth hackers and their growth marketing funnels. Growth thinking author, Nader Sabry, analyzed 3,167 growth hackers’ growth marketing funnels who have designed, built, and managed…