I found an ebay seller who charges tax on local CA transaction and I found that he's actually a private collector who doesn't have business account. I've never seen such a case that non business account holder charges tax and it looks like he tries to charge tax from buyers for hidden profit. Isn't it illegal? If it is, how risky it is to commit such an action? I am trying to buy stuffs from him but I get very suspicous of his behavior.