My home airport is SJO, so most of my flights start with SJO-IAH. Prior to the merger, I never missed an upgrade on this segment. Not once. Most of that time I was CO Silver, but my travel has since increased, and I am now Platinum. I missed my first upgrade on February 28 of this year. My next trip on 4/16 looks quite doubtful for an upgrade, and the return on 4/22 is even worse. When I try to buy an upgrade, there is no buy-up option with money, and the mileage upgrade has the remaining two seats as "waitlist only" for this portion of the reservation. Why in the world would they not offer me an option to pay for an upgrade? I reference the SJO-IAH (and IAH-SJO) segments as examples, but I notice this on almost all reservations. The "waitlist only" will never again lure me in, no matter how many open seats are showing in BC. I once used an upgrade from ORD to SJO via EWR, and they upgraded me from ORD to EWR, but not EWR to SJO (5+ hours). So my 2 hour domestic upgrade cost me international upgrade miles, and my rear was very sore upon arrival at SJO. I moved from AA to CO several years ago because of AA's near-universal arrogance (individual exceptions duly noted). While I have not experienced anywhere near the arrogance on the part of UA (or ExCon) employees, the depreciation of benefits is almost equally troublesome. Add the inability to upgrade for MONEY?.... What in the world are they thinking? They prefer to have someone else's money instead of mine? I just don't get it. I have 10 segments scheduled over the next 2 weeks. Maybe I'll feel differently upon their completion, but right now I'm anything but confident that I'll enjoy much if any benefit from being PP from now on. Even my May 20 SJO-IAH flight won't let me pay to upgrade or confirm a seat with miles.