Others may already be aware of this, but it was news to me. My wife and I had a flight MGA-IAH on Sunday. Prior to the flight, we purchased upgrades through the app, resulting in a change of fare code from K to P. When the flights posted to our accounts today, I noticed that the PQD and RDM totals were calculated on the base fare prior to purchase of the upgrades (upgrades were about $280/ticket, if I recall). PQM posted with the bonus applicable to a P fare. I called in to the Mileage Plus Service Center and spoke with an agent, who then spoke with a supervisor. Both confirmed that the buy-up does not alter the underlying base fare, so PQD and RDM earnings are not increased when a passenger accepts a buy-up offer. Assuming the agent and supervisor are correct, this reflects a poor implementation of a revenue-based reward model by UA.