So why does the developer need the services of IBN? If they have...

So why does the developer need the services of IBN?
If they have all the marketing and sales covered, why the need?

So what does IBN spend $200,000 a Q on marketing on exactly?
I'm confused, its not on any form of social media, and its not using the services of the 2 external marketing social media companies as I can see that's not happening, so where is it being spent?

If the developers have their own sales teams and marketing teams, then why the need to have IBN?