With all the fall/winter fare sales, most of which are probably G T R fares, I've seen a lot of instances of premium upgrade at booking being an increase in the $20-$40 range to a qualifying fare as a Gold.
Depending on the distance of the flight, and how much drinking I plan to do before arriving at the destination, I may or may not pay for the immediate upgrade instead of taking my chances with an R fare at the end of the line during the upgrade window
