Apple TV is a very basic product, in a lovely package. The A5 inside is 2 years old, it only has about 8GB of storage and, what 512BM of RAM - it's very cheap to build, no battery, no display. Apple are not losing money on it.
Roku 3 is actually cheaper but might even cost more to make given Roku's lower sales and lower buying power. If Roku can make money, Apple certainly can.
The guy is clearly an idiot.