Illinois tax liens..0-3%?

[Chris Bojanowski]

I'm VERY new to this, so I have to be overlooking something.  In Illinois they do a bid down auction on the penalty interest.  And after some research, I found the majority of the winning bids on the liens go for between 0-3%!  How are people making money with those interest percentages?  Seems like a ton of leg work for such a low return.  Am I missing something?

Thanks!

Chris