Conversation so far:
what was Slipknot (band)'s image?
attention-grabbing image; the members perform wearing unique, individual facemasks and matching uniforms--typically jumpsuits.
what other things played a part in their image?
The concept of wearing matching jumpsuits has been described as a response to commercialism in the music industry and led to the idea of assigning the band members numerical aliases.
What else were they known for?
Several band members have said wearing the masks helps to maintain privacy in their personal lives.
Were they successful?
The band's image has been the subject of much criticism and controversy, with critics generally accusing it of being a sales gimmick.

Question: How did they respond to that accusation?
Self-contained rewrite: How did Slipknot (band) members respond to the accusation of their act being a sales gimmick?