I setup PPC adword campaign for Buy.com products , but i found out many product link go to a page will message : "Thank you for shopping at Buy.com. We're sorry! Due to the high volume of traffic we are experiencing at this time, we are unable to process your request. We apologize for the inconvenience and invite you to check back soon. " they didn't inform me this , i spent some money at google adword but get nothing.