"Omiya delivery health (the call-girl format) and pricing" — some people hear that and immediately get it, and some don't.
I'm 42 and still out in the field of this world, so I'll lay it out from a real-world point of view.
Why this topic matters
A surprising amount of fuzoku information is poorly organized. Beginners especially tend to land in a spot where they don't even know what to look up first.
What it comes down to in concrete terms
In one line: knowing versus not knowing changes the quality of the whole experience.
What I've written here is the essence of 20 years of accumulated knowledge.
Last thing
If you've got questions about this topic, drop a comment or hit me on social. And check out First Class Ruby while you're at it.