RE: Idea: Use posts popular outside of the steemit community as (rewarded) part of promoted post promotion.
Well, I did think of taking a short-cut...if I make some money in real life. I will buy enough steempower to boost me, but I will also examine the wallets of posters I admire and where necessary, I will delegate enough for each of them to be strong enough to be seen by more viewers, for as long as needed, then take it back for passing on to others.
Now, all I have to do is wait...and wait...and....
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Sorry, I did not mean that I do not agree with your proposal. I do agree and it makes a lot of sense. I have tried helping a couple of posters with promotion, but decided that unless I can pay the max, it is not worth it, so there are posters I would have back that were not backed - and I saved myself a lot of money.
Your idea is one way for dealing with the one-way street that mostly goes nowhere