I have noticed just a few spammers around here, but according to what you write it looks like there is much more of them then I thought.. Well I guess nothing perfect exists on this world, however, Im quite sure that their reputiation go fast down and people flag them, more I guess can not be done for now :) Lets see if it will improve in future, Im curious about it :) According to my understanding Steem developers are very flexible and ready to improve steemit in any direction that is valuable for community :)