Thanks for your replies! I'll check from time to time to see whether the price changes at all. But if it doesn't go below the regular fare, there's no incentive for me, especially since the feeder flights are not upgradeable.
unlikely to go down honestly. If anything, they go up.
Granted, the scheme isn't for everyone (myself included)
Interestingly, the one time I actually 'bid' or used this sort of 'upgrade yourself' thing, the scheme was discontinued the next week, and so my 'bid' didn't go through.