I'll add this: As a seller of long tail one offs, I rarely look at the Traffic stats (impressions , views, etc) because they don't really provide me with useful data. The real value in those stats is not the numbers, it's the RELATIONSHIP between the numbers. And it matters most to multi quantity listing sellers. For example, I am selling a whatsit. I have 100 of them as my quantity. Over the last two weeks (or whatever) I have had 10,000 impressions, 10 views, and 1 sale. In all probability, I should be asking myself, why aren't people clicking through? Could be a number of things, but it might be price. They aren't clicking through because they see the price in the impression, and it's so high they don't even bother clicking in to the listing. But let's say, you have 10,000 impressions and 6, 000 clicks, and 1 sale. Now, it's probably not price, because they've seen the price in the impression and many of them have clicked through anyway. So, why only 1 sale? Now you've got to look carefully at your listing to see what might be preventing people from actually clicking the Buy It Now button. ....well, I'm sure you get the idea.
But I sell one offs. My items will always have only one sale no matter how many impressions or views, and once it gets that sale, impressions and views are moot because it's gone. Yes, it still might be somewhat useful to compare impressions to views, etc, but that's a fair bit of effort and it's not going to effect the number of items I'm going to sell from that listing anyway, since one is the maximum I can sell.
Hope that makes sense. I don't always explain this stuff very well.
