In comparison to Google , Fb ads are really easy to run and maintain as long as you keep testing out what works and what doesn't, it wont take you long to figure out how to keep the ads running more than a month . Creatives and ad accounts make a huge difference as well. Lot of other minor weird tricks i have come across that only works in Blackhat and most people wouldn't even understand it unless they have been running ads for a long time as well. But yea Facebook has been becoming a bit expensive