Minimum bid demanded of around USD 350 for KHH-ICN on a Y flex ("up" fare) flight I booked direct on BR. This minimum upgrade price added to the original fare paid would have made it actually more expensive than the cheapest J ("Business Standard") fare available. I think BR needs to look at their minimum bid pricing - or perhaps they actually don't want rationale and numerate passengers bidding. Either way it struck me as extremely odd...but then most of my experiences on BR have been a bit "this is our service and we are totally inflexible".