Originally posted by MacStripey:[..]
too many concerts?
Hardly.
Their tour schedule is nothing more than a leisurely stroll through the country compared to the concert schedule of the 360 Tour. I believe his voice get worn out because he's very, VERY, active and mobile during his performances. He reminds me of Bono during the Joshua Tree Tour, except more of a spaz. It's a unique part of his live act, for sure, but I don't think the habit is doing his vocals and favors.
With their NA tour dates released, I was initially excited, but then not so much when I found out that the shows I could have gone to were in early May which is exam time for me...
If he moved, jumped and danced a bit less, his vocals would drastically improve - I think. 
