Thinking about this a little more, auctions are quite an interesting system and I am really looking forward to something that offers proof of bidding.
The market dynamics will keep people hooked on both bidding and selling imo. It seems dev wishes to provide some gamification to the proposed platform and give value to all users. This is an encouraging proposal which I feel would benefit from some economic trials.
I would urge the dev to push forward a road map and even consider running special events that tweak certain dynamics of the bidding process to trial community interaction.
Good luck, and I look forward to hearing more!