Well TK is definitely trying very hard to grab every penny for domestic US tickets:
Flight operated by United Airlines
Mileage required for round trip economy class ticket LAX-DEN-LAX: 15000miles/person
Tax fee: HKD 1373/person
Same thing if you use MP - 25k points UAMP points plus HKD 180 tax.
One thing that's strange though is that I don't think the flights I'm looking at is totally based on UA's saver award. I asked to look for 5 award seats and there are definitely more flights available than the UA saver award at united.com.
Not that I'm interested as at this price I might as well pay real cash to buy the tickets as the YQ is so insane.