1.PPC (and other marketing) gets traffic in by advertising.
2.PPC gets results fast - often within a week or two.
3.PPC is fast and easy to target, for the experienced.
4.PPC provides fast data on many market factors.
5.PPC is quick to re-target, and agile in many ways.
6.PPC is the fastest way to lose money when badly run.
7.Site owners often believe they can do PPC - but tend to do it badly unless they have had professional training.