Order in title is not that important, if it matters at all.
Erica, Cheryl probably means Promoted Listings; it is a way that you can get added exposure for broad terms.
Broad keywords may bring a lot of views, but since you can never guarantee you placement for those searches, and because most internet retailers get most of their sales from more specific (also called long-tail) phrases, it makes sense to focus on having the best variety of long-tail phrases possible; they will generally naturally include the broader phrases anyway.
Our best keyword phrase brings in something like 10% of traffic, which is a lot! But if I lost standing on it tomorrow (unlikely as it is not actually all that large a search, but possible) I would only see a 5-10% drop in traffic (if that, because we run promoted listings), and when I track my sales I generally see that they come from more specific searches, so I suspect that revenue would be down less than 5%.
There are also broader searches than our best one ("labels," for instance), for which we sometimes have good standing and sometimes not, right now not; our views from them are in the first page of search terms we get views for in our stats but they're not searches I ever worry about, because there's no point.