Disagree strongly with the above especially re typeins not being a reason to buy
Visitors that only open a page, or not only open a page but do also read it - without doing anything else, are just bandwith waste.
Whatever the way the came to the page, such visit is worthless.
Not only worthless, but why should they ever come back if they saw nothing of interest for them the first time?
Type-ins are good IF those visitors participate in the revenue of that web.
IF there would be a top evaluation parameter, it would be (IMHO) SERP.
The higher a url appears in a search, the better;
But, then, it is not sure somebody will go there and do anything ...