The skills that a professional writer has are much different from an average person. Just being a good writer is not enough. They know what the public will be attracted to and what will direct them towards you.
As for copied content, remember these can never capture the true essence of your brand. People will skim by the uninspiring material and it will be gone from their memory soon enough as well.
Be careful that by trying to save cost you don’t end up losing much more in the long run.