I agree with you that the current system in place does not really provide much incentive for some investors to want to curate, they rather sell their vote to generate more income or self vote, and changing of curation reward to say 50/50 would prove to be helpful here, but personally, I think this will help both party author and curator when there is a spike in price, that's to see a better reward would be seen after upvoting.
But all system can only be achieved or fully understand after they must have been practiced