Access to older posts could maybe made easier with the ability to highlight different posts with colour tags and you can find them easier in your comments or replies tab.

Your theory fails in there is low community reward and a high reward for whales. And an increasing difficulty for lower levels to gain a voice.
Such a system would bring the most viewed to the top of your search. and open the doors to further abuse by bots and a whale with greed posting anything and his loyal followers will upvote, and then returning and doing the same with every older post they have placed, a continuous income growing with each follower they get upvoting on every post they have made previous and to the future, will quickly devalue the currency.

Solution needs a lot of thought and a community consensus on what a max value a post can have, with a limited amount of post been permitted per day Possibly the second post only gains 50% of the value. Any proceeds over this amount would go back to the community?