So Eve is starting this new thing. For those not familiar with Eve, when you're not playing, your character still gets "experience." So the longer you have an account, the better your character is gonna be (this isn't the new thing, only the background). But only one of your characters can get this "experience at a time." (i.e. you can only train one character per). Now recently they announced that if you want to pay for multiple subs, on the same account, then you can train up multiple characters at once. This is something Eve players already do but just have the characters on separate accounts.
Other games players have multiple accounts so they can play multiple characters at once.
So since we all know that ESO is gonna be a sub-based pay model (obviously we don't know, but we can't hope for quality if it has a different pay model *cough*GW2*cough*), I say we should get this implemented here so my wife and I can buy the one game, pay multiple subs, and play online together (like almost any other game). It's no different than buying a console (or many pc games, duh) game and going online, or playing one of the many games in local co-op setting. It'd be awesome to be able to pay multiple subs to one account to be able to have two active logins to keep the characters on the same account.
Overall, it makes it easier on the consumer to do what the consumer is going to do anyways. So why not make it easier?