This decision, the owners of the project supported investors who will buy work tokens. I have seen participants of the bounty program fail the price of tokens more than once.
Why this bounty program at all need a? The effect of bounty is very small, it is easier to order advertising from the same Google.
I do not agree with you, advertising in social networks is gaining its relevance higher and higher, for this, bounty company would be useful to the project.