To quantify darkys statement:

Within 2 lengths or leader at Turn:
All price ranges:
15125 Selections
$12962 return (86%)

4 lengths or more from the leader at turn:
All price ranges:
6703 Selections
$4869 return (73%)

Lets assume we stick to those with a chance so under $5:

Within 2 lengths or leader at Turn:
3450 Selections
$2988 return (87%)

4 lengths or more from the leader at turn:
806 Selections
$629 return (78%)


These stats tell us a few things. Firstly its an advantage to be close to the leader. Secondly most people already know about it.