I don't understand how bid limits could solve this problem. Wouldn't the abusers create more accounts to reach their targets then?

Introducing bidding limits would put large accounts at a disadvantage. We don't want anyone to have an unfair advantage, but putting someone at an unfair disadvantage doesn't solve the problem either.

That only punishes honest whales who wouldn't work their way around that.

Moreover, if you see a whale sell-off due to the bid limits, the rewards you receive from the system won't be worth much.

In addition to that, you need 51% Steem Power to implement that idea. Do you really think that people having that kind of Steem Power are going to agree with their bids getting limited?