I think I'm the first person to get an already ranking site from hacko and I can confirm those sites have great earning potential.
IMO there are two approaches to those sites:
- if you have a tight budget you add few 500 words articles targeting some long tails related to the main keyword, start with a small diversity package to build a link base, and then drop few strong PBN links each month targeting the main keywords and some of the long tails - this should allow you to rank pretty well without spending much money
- if you're like me, and like to go big, you can plan out an authority site searching for easy keywords in related subniches
I've tried many services offering ready made sites and this one is, without any doubts, the best one.