I agree with the 1 account per user! But in this case, the account is the subscription you pay for.

I have my PSN linked to my SE account, On the Playstation i have the game installed, but i cannot play it because the activation code is linked to another SE account. Even though i have an active subscription to access the game. I just find it a rip off that am I unable to log in via the PSN until I buy the game for a 2nd time. Well technically its a third time.

2 x £8 per month subscriptions and 3 x £25 (roughly) one off payments seems a bit extreme.