Looks like we have ourselves a serial cross-chainer! Your small ring shows little, if any wear, which tells me you tend not to use it very much and instead stay in the big ring even when riding up hills in the big ones in back,(unless of course, it is newer). This produces the type of scuffing wear we are seeing on the ring, as the chain enters and exits it at an angle.
Had a guy come through the shop with "shifting issues" who had destroyed a chain, chainring, and lower derailleur pulley on a Dura Ace drivetrain in only 900 miles. His small ring could have been sold for new. When asked he said "big ring's all I ride". And it cost him $300 to fix!
I understand that's not your case, but even at 20K, the wear between rings should be more even, and it doesn't appear to be.
Last edited by BikeWise1; 12-08-11 at 07:59 AM.