What stan said sounds reasonable, we need a lot of competitors with high payrate delegates to join first, and then distinguish their contribution.
However, BTS is still at very early stage, the infrastructure(wallet protocol) is not well ready yet. It is therefore necessary for the core members like BM to be cautious to take any chance that might break down BTS, because once the community lose their faith, the second BTS might come out and win the final battle. Because the idea of BTS is already well known, and the technique is always second important. Just like Amazon was not the first E business company, and APPLE was not the first to make cellphones.
As to the thought of the OP, in my opinion, 3% delegates are responsible for wallet update to secure the system, so BM should have a full control of them. However, it is not appropriate for BM to vote for the high payrate delegates using AGS fund, because there will always be some guys think that BM is not as good as the whole community to distinguish the contribution of delegates. Moreover, it has been proved that the community can hire toast by their votes, so other high payrate delegates like BM, STAN, Methox, cass, bitsharesblocks，etc. can also be elected by the same way.