Nobody else is going to test it. If we don't test, it gets released as is. It's paying them for doing their work for them.
It's like getting your oil changed, and then being charged to check the dipstick yourself before you leave. It's sad.
However, I'm a free market capitalist. There's one born every minute. Just glad I'm not one of them.
They have an internal QA team. Obviously it's going to be tested with or without us. It's just best to have some help with a system this complex.