It seems to me that our Product Listing Ads for a certain site are not appearing as much as we'd like. They are targeted to very keyword relevant pages. My guess is we need to increase the bids but I have no idea how much because unlike search ads, it seems there's no place to determine what to bid vs. the competition for PLAs. How do we determine that? It seems silly that Adwords search ads would provide all of this relevant data but AdWords PLA ads would not. Please advise. Thanks in advance.