Interesting thoughts, but I'm not sure I agree.
There is transparency among bid bots thanks to @yabapmatt's steembottracker.com. Everyone can see how much they will get at least / at most and can choose the bot that has the best rules for them (ok, given that there aren't many last minute bidders). That also includes the fee (if any applies).
It's not only whales auctioning their votes, but any size or type of bots.
Auctions are an effective price building mechanism especially when liquidity is low. In addition, your example with Bitcoin seems odd because votes are typically auctioned in fractions.
What will a "decentralized" bid buying system look like? How will it actually improve transparency and fairness? Could you provide details? I'd be happy to help :-)
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allow anyone to sell their vote for whatever price they choose without taking a cut. problem solved; free market achieved.