[50-metre penalties] increased by more than 40 per cent from 2005 to 2008. There was a lull last year, but this year they are back in plague proportions. A total of 445 already have been paid, more than in any previous season, and there are still two rounds to play.
...
Since it must be presumed that AFL footballers are not approximately twice as remiss, wanton or derelict as in 2005, the nature of the so-called offences bears examination.
http://www.theage.com.au/afl/afl-news/game-backed-into-a-50metre-corner-20100820-138zj.html
Decent article by Baum which pretty much echoes my sentiments on umpiring, past and present.