Something that dis-incentivises vote buying would help, but I am not sure what that should be.

Downvotes (hopefully)

it has to be for the good of Steem and not just to protect the investments of whales and orcas

I would not be in favor of it if I did not believe it was for the good of Steem.

I would suggest that the calculation of account reputation should make repeated votes by the same account have less impact as we have various high rep accounts that have little community support.

The current reputation system needs an overhaul - agreed.