Hi, thanks for your inputs. By referring devaluation, did you mean the price decline of steem or declining reward pool? If you are referring to steem price, I don't think it will depend on individual users action, rather its a community effort. There are some self declared self-voter on that community, but that doesn't stop coming of new users and making good quality content.
If you are referring to the declining reward pool that we all noticed after HF19, then its not declining anymore. I have noticed the reward is not declining by time even the steem price is not fluctuating much.
By no means I am supporting exclusive self voting. I just don't understand why there such a huge gap between rewards. If my calculation is nearly correct, steemit should fill the gap as early as possible.
I do mean the price of steem, and you're right it doesn't depend directly on an individual's action, but on the aggregate of all user actions. When there is a high ratio of self-vote/curation, we should probably expect to see the price of steem go down. Whales do have more influence on that aggregate than minnows.
If I understand your question, the gap between rewards is probably because the self-voter collects author rewards and curation rewards, but the curator only gets curation rewards. They could close the gap by posting some comments or articles and getting author rewards via upvotes from others.
I have also seen a post suggesting an increase in the curation reward percentage. That wouldn't eliminate the gap, but it would shrink it.