im not sure haya deserves much blame,she made a decision,she wanted the toaster over the pillow,what is so wrong about that?
she saw the toaster in action,harry saw the pillow,she had to make a decision so she went with the one she had seen,makes sense,if she hadnt and they still lost(whos to say pillow would have definetly won them the task?) then SAS would have ripped her a new one for not trusting her own gut feeling.
also toaster sold well,just not aswell as vaccum