I am a "don't tear others down to build yourself up" type of person- so I wouldn't attack WB to promote AH.
I don't think there is anything inherently wrong with posting information such as this in a high-traffic area, so long as there is not attempt to create division in the community. Some people could post this and it would be cool, others couldn't, because their agenda shines through too clearly.
Stiglr, I am glad for WB that it will be flat-rate. Your abrasive appraisal of AH is what has won you "friends" here, and guarantees any post you make will be viewed skeptically, whether it is "good news" for all or not.