If you are selling on Amazon. It's best to use amazon's ppc ads which are native to their site. ecommerce sites that are selling through magento, shopify, volusion, etc. I know uses facebook ads, and pinterest ads. Not sure about Bing and Google ads
hey Popac89, there is no easy answer to this question, so I'll reply with the standard.... it depends! it really does depend on the product your're selling, the target market, and how deep your pockets are! but for it to work, you gotta put the time into tweaking it for specific keywords etc. what you can afford to pay per click may differ from another business. so that is your answer to "is it worth". again, I do like adwords, but it can be expensive. so try it for yourself. it may or may not work for you, but it is cheap to get started. good luck. -M