Listen, adwords are great, and I haven't put it properly in my previous post. What I wanted to say is this- You're gonna invest $150 in adwords. You're gonna say-"Hey I did a great keyword research, I targeted teh right set of keywords and I am going to invest $150 and visitors are gonna keep rolling" After those $150 are gone you will sel 2 or 3 products for $80 (if your sales page is great) and you will be in minus. If you're really lucky you will end up saying "Hey I earned $23 with Adwords...."
Now, adwords are great if your monthly budget is $5,000 but I guess it's not....Big companies that have piles of money can invest huge ammounts in adwords and they will earn even more money, that's the whole idea. Always was and always will be.