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I don't agree with the blanket statement, and that isn't what @steemed said either. Indeed one of the benefits of SP, including owning a lot of it, is being able to promote your own posts.

The issue specifically is generating large rewards on a witness report that is already reporting on the process of earning rewards as a witness. It is unnecessary and effectively a form of double dipping.

In fact this is one of the reasons I don't make these posts myself. It reminds me of politicians who send out newsletters claiming to tell everyone about service to the community, but in fact are thinly disguised campaign ads. If what you are doing adds value then it ought to be easy for people to identify what it is you are doing without another post specifically advertising it.