Example: you have 5 accounts and then you share sMerit with your each alts, does anyone know if you're abusing the merit system? No. Only theymos and Cyrus might know since they're an administrators.
It will increase the administrators work, so I don't think they will keep watching and moderating the merit flows between each account.
I currently only have 2 merits and read at least 50 posts every day, with about 10 of them being merit worthy. However, when I don't have any merits to give, I simply move on.
If you mean thumb up is merit and thumb down is demerit, there's few people have made proposal about it, but it seems really hard to implemented, abused etc.
If you see a good post and don't have any sMerit just create report in this thread https://bitcointalksearch.org/topic/self-moderated-report-unmerited-good-posts-to-merit-source-5093271