Of course it's scam! A scam doesn't have to be illegal.
now thats one of the silliest and incorrect statements i have ever heard, lets just make it black and white and not alter the facts to suit ourselves
what is a scam as defined in the dictionary and in law--> A scam is an attempt to defraud a person or group by gaining their confidence, now the important word here is "fraud" and as we all know, fraud is illegal, thus for something to be a scam it MUST be illegal
so i will state it once again, if you have sold any of your so called "premium" domains for more than their advertised price of $237, then based on your own logic, it would also make you also a scammer