We are talking about non IPB parts of our site. Even if IPB allowed the source code out to us, I'd now have to make custom edits to the code to add the others parts of the site and then maintain the code over time. This costs money and time and is in addition to having to maintain both the mobile web and desktop version. Assuming at best the app had equal monetization then this is a net loss in income.
Do you monetize your site and if so I'm curious on your take? To me if a feature leads to increased cost / decreased monetization overall, then I'm not quick to want to us it. I'm running a business after all.