Eh? My current ticket is 44300 miles in First for US$9000 including taxes, which is only a little more per mile (and I didn't optimise it for maximum mileage) - in general I'm sure it is possible to do AONEx tickets for less per mile than your coach ticket.

Having said that, your routing doesn't fit well with any of the alliances, so for that specific list of destinations it may be hard to do better. You are choosing to travel of some of the, er, less well-renowned airlines of the world.