While the creative industries are based upon inspiration from and use of certain ideas and elements from previous artistic works, when there is a wholesale and slavish reproduction of a work, the artist of that work should not just shrug it of as part of the business, but should enforce his or her intellectual property rights to deter future biting.
Intellectual property rights are just as valid as rights one would have in a car or a watch - if one owns something, others shouldn't be allowed to freely take or make use of that something. Only by enforcing these rights will those who bite others' designs and expressions reconsider their actions in the future. The government recognizes this and has enacted strong laws to protect artists who have expended considerable time, labor and resources to create the works and punish those who steal the artwork. If anyone is interested in discussing how to protect their art or prosecute someone who is illegally benefiting, either monetarily or otherwise, from exploiting their protected works, let me know.