Distribution, distribution, distribution, and there's the big issue (and the elephant in the room that everyone keeps ignoring) which would keep any sane investor away from steem right there. I think something worthy of investigation would be places that USED to accept steem and do no longer, and no one seems to care. See Shapeshift (virtually instant conversions at market rate), see livingroom of satoshi (bank acc filled or bills paid with steem).

From memory they were removed due to a lack of interest and the infrastructure is not exactly reliable causing more work for the companies to support (running their own partial or full node to mitigate and actual time/effort responding to tixs.) pushing costs and margins so tight they ended up dropping it altogether.

You should mention anon.steem.network also, while you are talking about services run by someguy.