In a "free" system such as the steem blockchain each participant has it's own agenda. @blocktrades runs a business and I understand why he is trying to capitalize on an opportunity to profit from it.
If we analyze it it's basically a lease on SP. The service can actually be used to grow the influence of a community. If my math is correct at the end of the delegation period you can get a ~17% ROI if you just auto-vote (10 full votes per day).
If a community pools their resources into one account and then uses the delegated SP to vote on the posts of it's members the community can grow it's influence over time (measured in SP).
The difficulty would be to setup some sort of social contract that everyone agrees on.