Adding a auctions and bidding features would definitely complete the application.
For mine perspective and and personal Interest I planning to use nopCommerce in 100% of the actual application but I would like to add also the features of Auctions and bidding.
If anyone would like to start or already start developing this feature lets get in touch.
Final but not less important if this feature already exist in 1.40 and I haven't realize it please let me know.