I explain this in my post and say that you should compare the two ratios and use that as a means to decide which direction to go, i.e. buy steem with sbd on internal and sell on external or sell sbd on external.
In fact, you are right that there is no 'premium.' The market is in total equilibrium in that respect.
with all the headlines saying "SBD is selling at a premium", my guess is the vast majority of people only go one way without considering the nominal premium might not be enough to compensate for the discount. but all in all a very interesting market event
Well, the point is to attract users to READ the entire article, not just the headline. If they do so, they would see there are 2 options for a 'premium'.