No, it is absolutely not illegal for sites to sell model essays. There are literally millions of similar websites operating online today. It is likewise not illegal for you, as a customer, to buy an essay.  On the other hand, we do not condone cheating and would advise you that our papers are to be used as a model, not to be turned in as your own but used as an example for you to understand better how you may craft a paper based on the requirements you send us.