promote Clickbank products using Google AdWords?

Is it worth enough to do? or complete waste?

You have to be careful with the product that you chose to promote. Most times, "high gravity" products that are both buyers PPC that CPC have shot through the roof by the time newcomers entering the field. The best thing to do would be to go "organic" way by writing reviews and articles. If you are hell bent on the PPC, the pursuit of the long queue to do a little research of keywords. Good luck!

Make Money using clickbank – Commission Blueprint