This is the faulty part with the ethics debate. A search engine's viewpoint is self-serving.
Originally Posted by Kovich
I follow their rules, but I do not see them as a guiding light for moral behavior. Ethics is a moral philosophy issue. Each search engine has their own problems with ethics and activities that some people justifiably view as illegal or unethical such as stealing copyrighted images, invasion of privacy issues, partnerships with click fraud rings, PPC billing overcharges, etc.
Don't you find it curious that the largest link seller on the web penalizes sites that sell links? Which side of the ethical argument does that fall on? Who is unethical? Is the link seller who doesn't follow a search engine's guidelines or a search engine who appears to be trying to limit their competition?
Ethics is always a matter of viewpoint. Perhaps you should be asking if someone knowingly violates search engine guidelines, rather that referring to it as unethical SEO.
"It's inexcusable for scientists to torture animals; let them make their experiments on journalists and politicians." -Henrik Ibsen