People who sit at the AH forever and constantly cancel auctions and relist are just bad. They're defeating the purpose of making easy gold for the time spent with that method of AH playing.
To sit there for hours, constantly canceling and re-posting auctions (losing deposits, and time), you're just as bad at gold per hour as someone who farms. Might as well go out mining, if you're going to spend all that time doing the work, instead of letting the AH do the work.