I've always loved the ScareFactory robotics, they're amazing! I wouldn't say it's the prospect of guests breaking the devices, it's more in the cost / downtime realm. Most robotic units like that will fall in the ballpark of $2,000-$15,000+ , that's quite a few admissions for a single robotic unit not to mention maintenance. If you think about it....putting a $15,000 pneumatic / robotic unit in a single scene, in a single house and it breaks, you've essentially lost the impact of the room plus you'll have a maintenance worker visible while trying to repair the unit, or they'll leave it broken for the night. They're just risky ventures for guest satisfaction, and considering the risk involved I can see why we haven't seen them implemented. Not to mention you can typically hear the pneumatic actuation from 20ft away on most devices, that would be like hearing the chainsaw 3 scenes before it happens.