The company is still thriving, you can check out their website to find out more about what real estate inspection is about (in The Netherlands): https://www.aeroscan.nl/

I believe it could be the weight of the camera and lens you would desire for good looking photos (think Sony a7 size). Good looking photos sell houses.

EDIT I just noticed the “inspection” part. Maybe they wanted good zoom to spy on the tenants? (Or maybe that’s a really uncharitable take).

To me, high quality photos for real estate inspection means (e.g.) being able to take high resolution photos of a specific part of the roof so you can understand why there’s a leak. Not having to climb is a big deal!