Interesting article in the Jan 2011 Inside football re draftees.
This is a summary re the SANFL with the numbers from each club since 2000 and the average number of games for each at AFL level.
Magpies low in picks but they have lasted longest.
West 31 drafted, average 39.8 games
Glenelg 24 34.1
North 24 24.3
Norwood 24 18.2
WWT 22 34.5
Central 20 27.0
Sturt 17 36.9
Port 16 67.1
South 9 20.4