There are no experts to talk to, only vendors of PPC's who want a commission on what you buy.

A better question to ask is, why do you need PPC's or any advertising at all. The bottom line in advertising that no one will tell you, not even Amazon, is this. Advertising will not help sell a dead product that no one wants and if you have a good selling product, it is not necessary. Now, where does your product fit in?

Remember, successful online selling is all based on keeping for yourself, as much of the profit in the item when it is sold. All advertising is paid out of your UNEARNED PROFIT., whether or not the item sells. This is what makes the second paragraph so important. If you are selling a product that is a slow mover, and throw advertising at, you just may end up with no profit at all.