As already noted it may make more sense to buy cheap tickets via consolidators, would it be correct to assume these are the same as those that don't earn PQD today?
from the FAQ:
http://mileageplusupdates.com/faq.html
The types of specialty tickets that earn award miles in the current program (including but not limited to consolidator/bulk, group, tour and other tickets where the fare you paid is not provided to United) will earn award miles based on a percentage of the distance flown and the purchased fare class on or after March 1, 2015. Please refer to the chart below for details.
United-Consolidator-earning:
So am I correct in assuming these are PQM as well?
If so this is one way around the PQD & rev based earning issue altogether at least up to Plat, assuming you qualify for the waiver. Though I guess you only earn at 75% in reality.
You also earn your usual Premier bonus RDM.