They just need a pool of receivers and don't have to worry where the receivers must be used. It is vital to have a professional install the system. It must be installed carefully for correct coverage in the room. You have to ensure that the signal can be received at every seat. Home systems are also only built on this frequency, so you can take your receiver from home to use in movie theaters that have an infrared system and have a seamless match.
Most people have the body pack style of receiver.
It's nice because you can plug in any accessory such as a neck loop. Telecoil capability is built in. Some have a jack that can be used to support neck loops. A smaller room has a lower cost. Volume is also a big factor.