I stopped upvoting my posts a while ago in order to make more reward available to others. I am fortunate to have a dolphin level stake and I wouldn't expect anyone below a dolphin to do the same. It is in my interests to see steem distributed more widely but I am also just happy with my stake. Ultimately the ability to choose should remain and with the acknowledgement that every situation is different. If I was to produce a post that took a great deal of effort or I thought was very valuable to the community and needed maximum exposure, I might choose to upvote my own post.