It bothers me a lot the fact each account has the right to cast more witness votes(30 votes) than there are spots among the Top 20. Specially if some day a billionaire decides to purchase huge amounts of Hive to control the chain. The idea is that he can purchase a position among the Top 20, but not the whole Top 20.

Possible solutions:

• You have the right to vote only for ONE witness(I don't like this solution either)
• Vote value divided among the witnesses you voted for.
  • Can be a static division:
    • Can be done with removal of the hard limit of 30 or increase to, let's say, 100.
    • The less witness you support, more support each one gets.
  • Vote distribution can also be dynamic, where one allocate the percentage of vesting power destined to each witness.

And such implementation can be only for votes cast AFTER a HF.

Just think about it.