Damn~ that sucks...
Reason I ask is because I have been using UA miles to upgrade my EVA tickets. (Eligible fares are B, Y, and K. B is the cheapest amongst all, while K is the full fare premium eco, and all 3 fares only cost 30k UA miles to upgrade to business class). So buying a B ticket is the best/most valuable way to use the 30K UA miles.
I need to start looking into what other points transfer partners from Chase and Amex offer similar valuable deals. The first one i think of is AC.... bummer!