To me spiritual marketing is the ability to articulate & convey your authentic beliefs around a service, product or brand transparently, consciously and with the end users benefit in mind.
What's so spiritual about that? It's what's behind that definition that drives it.
I get into the fact that living (& Marketing) authentically and transparently is about realizing your connection to source or divinity. If you realize you're connected to a never ending supply of source you can always have, be or do whatever you wish.
As an example many times I've come across lots of people who thought they couldn't be a sales person or market stuff to people. When the truth is they have been selling people on their beliefs & perceptions as well as marketing themselves for a very long time but just doing a lousy job of it in life.