Today I received a keyword while it had a VERY high volume search it was also extremely competitive. It was 9.9k usa searches. I had to compete with Walmart Target Etsy Amazon Ebay. Still not enough searches to really take on a giant for. Yet granted it was the most PERFECT Amazon keyword out there. How ironic right? Amazon sells a type of product and you rank for it and sell them back traffic they where ranking for. Search Engine traffic arbitrage. I did decline the keyword. All that being said the advertiser is paying .58 a click for that keyword. His research showed a bit more.