The first 20 rows are the VIP seats which go from like $400- $1,000. AMEX presale is not going to get anything from there.
I haven't had any luck with the Amex pre-sale because I found that after the pre-sale there were better seats available in the same price range. I think it's all a matter of luck....a real hit & miss. You can keep trying for seats everyday & crummy seats come up, then one day some really good seats will come up. It's a crap shoot out there!