Throughput, location, cost.
The attraction wasn't automated - all of the effects were triggered by 4 hosts inside the main body of the attraction chucking the rice, being the monster - pushing the fake wall, and triggering the sound effects etc. So it was hard to staff.
Also the marquee leaks. Many of the wooden flats sit rotting in a container.
Also the cost of putting it back up and hiring all the sound and lighting equipment again.
Don't even get me started on the fudging Gorilla head.