A lot of people trying to advertise for the first time ever and failing assume it's not possible to get a good ROI from it. To be honest, this is the good bit about advertising: you will need about two to three years to figure out the small stuff that gives you 80% of the results, whereas the larger stuff can be learned faster, even in a month, but only accounts for 20% of the results. It's a great moat for the experts who have stayed in the game long enough to capitalize on the ignorance of the overly confident newbies. This unfortunately causes a lot of monetary loss to a lot of businesses.