By doing what you are proposing, there will be no incentive to discover content ...
Isn't 'quality' itself a very strong incentive? In real life people pay to go to museums, concerts, to admire art of any kind! I am sure that many users would take the time to read again, explore content, be curios on new things ... if they wouldn't feel the pressure to maximize their curation rewards, if they hadn't the annoying feeling that others make money while they themselves are 'wasting' time with reading and upvoting (too) late. They could upvote great posts again which are even older than a day!
There wasn't any reason anymore to upvote posts like this, this or this.
If people have the choice between upvoting great stuff and low effort posts, with same rewards in both caes, I think the big majority will go for quality.
The idea of @acidyo, which you described, is very interesting!