Impossible to figure out why adwords isn't performing withoiut providing more info. I would start with targeting, assuming, you aren't an
SEO or have good knowledge of keyword marketing. Almost every in-house campaign I look at... that is the most glaring problem. You are also doing wholesale by the looks of it and I haven't seen that do well with PPC. All our efforts were bad. However, targeted to wholesale vendor sites in the content network it did better. Ask your google rep for a list. If you will
budget $200 a day
not spend they will even do the research to find the sites.