In the beginning of last week I asked 8 of my regular clients, 6 in the UK and 2 in Stockholm to keep a score of HOW they used the search, irrespective of site or whatever. Take in mind, these are all regular buyers, AD-agencies, graphics and designers and they dont mind spending either.
Every single one of them NEVER wasted any more time then to search first 3 or 4 pages, if no dice, on to the next site and the overwhelming majority used phrases.
None of them used any other then "relevant" or like the IS "best match" many didnt even think about it, or the search within, in spite of years of buying.
All in all, one guy, an AD and a friend, said, no we are trying to work here and havent got the time to look too long for shots.
Well, ofcourse you cant judge it by just a few buyers like this but my hunch is that this is the way the majority work unles theyre looking for an RM shot or something that costs a heck of a lot more money.