I did try investing 40 steem over 4 weeks.
I tried to to get up to 2 posts a day at times. Used half on myself and half on others then went overseas just before the delegated period was over.
I think overall its good in terms of voting and helping others and earn back from the interactions but overall I don't think can expect to gain any profit in the end using it on your own content. Its a nice feeling though being to upvote and see a larger number vs a few cents.