I'm still opposed to seeing any advertizing on Steemit as a default. People can use 3rd party things like what you mentioned, but I would like to control the exact amount of ads on my posts (which would likely be zero).
Perhaps an alternative would be a tip button or some form of vote that pays out per week/month from a portion of the Steemit reward pool that would be specifically set aside for that.
We can already send tips, the UI is a bit awkward right now for that but I think it could work well:
a button that if pressed,
gets a little pop up dialog "tip amount ___ to user"
input your amount, click send.
It's not passive but I don't think it would be too difficult to add that.