The problem I've seen with many peoples home theater systems is that they don't have a wired jack hooked up. So they need to purchase extra equipment. But a lot of equipment is just coming with an ethernet port. The PS3 has wireless and it makes it simple. Having wiress build in is great. Just seems like a logical step to put in in a reciever or pro-pro with a switch. Instead of buying more equipment to make an extended network.

You can't buy a wireless repeater for this type of system, you'd have to buy an access point client and even then those work with a single piece of equipment which would need to be a router is you wanted it to work with several pieces of equipment.