The problem is a site could be on page 1 and even position one but might not really be written well or and it sounds odd but sometimes it could be written too well or with too much info, any of these things could be driving people away for any reason even the look of a site can do it because from doing this for the past 3 years I have found that people looking for things on the internet can be lazy, and impatient and often if they don't see what they want instantly they will leave, they don't want to be bothered by doing just about anything. For some people if you can't sell them something so they don't have to do much they won't buy it.