Human beings are greedy. Let us say, a person has found at your website, the e-course you are selling (at your website) for US$20 and he or she knows that it usually sells for US$100, then he or she (knowing that it is an e-course), will next make an attempt to get it for FREE and research further and they will get to the pirated sources to get it for free. But, why ? Because human beings are greedy.
Your idea may work nonetheless, but incase people report your domain or website for selling something pirated, it does have chances of getting suspended. That is why (as everyone in internet marketing already knows), pirated stuff is done mostly on the darknet nowadays.