I always saw those announcement which are posted using official announcement thread. not only look more professional but will always attract more users.. announcement threads with random hero members is not helper anymore since Forum launched Premium memberships for newbies to show images now.
You are correct though but it still does not remove the intrinsic value that higher rank announcing actually entails. And for the service he is offering, if he can be objective about it, I see him building a reputation around that. Just like how we have some campaign managers, whose their enlistment attract legitimacy also DT members whose reviews carries weight the same way of he reviews honestly before joining a project, he can make a name for himself and that service is something that people wants because while everyone agrees that there is need for due diligence before investing in any ICO, majority are still lazy to do that due diligence and if someone is coming with such service with trust, I think its a good start.