How exactly did you come to that conclusion?
I think you're all making a significant mistake when you read the rules. The table of DCs all this math is based on isn't actually absolute. In the text above the table (p.42 last sentence in 1st column)
'A quick rule of thumb is to start with a...
Having run my first full on skill challenge in my game tonight, I have to say that these tables and calculations are ultimatley meaningless.
As long as you don't tie yourself down to the lists of primary skills and allow characters to play to their strengths (within the realms of plausibility...