Search Volume of these keywords is lower.
Eg. Compare the following search volumes
Buy iphone 6 = 11.1 million | Swiss watch = 18,100
iphone 6 = 40,500 | buy swiss watch = 70
However, the commercial intent is way high and bidding on such keywords in Google CPC is more likely to get you the ROI.
Please add more “commercial intent keywords” aka. “Buy Now keywords” in comments. I will approve comments with keywords of commercial intent. Thanks!