I am not sure about Unity's licensing for use in apps like Sharpr, but check this out:
no shaking, steady placement without the markers and even the lighting is adjusted to the real conditions (!!!).
Being able to view a model in the real environment (no texturing needed imo) would add a great value to the app as its perfect for quick modeling of architecture, furniture or simple machines.
I use your software to help me to convince my customers to some of our ideas, to do on-the-fly changes and so on, the rendering in real time/environment would triple the WOW factor
Please reconsider, as implementation does not seem to be that difficult and time consuming with the new ARkit .