To my knowledge @steemcleaners are rarely at 100%, which is the point where SP is truly wasted.
I don't know if the same applies to @spaminator.
As I stated before, @anthonyadavisii is working on a steem engine token, to replace the current reward system, which has clear drawbacks.
@anthonyadavisii, can publish a post detailing what work needs to be done to officially publish the token? Maybe a few interesting Steemizens will volunteer to finish the job faster (I can upvote any post that showcases significant contribution to the upcoming SFR token code)