That is another GOOD idea.

+1 Toaster. I like the cut of your crusts.

Toaster wrote: What if you just make it so that they have to "activate" the free Premium?

So, the account starts out basic but there's a link in the profile settings that would activate the free 30 days of Premium. If they haven't found the link just by investigating their account, then once they've completed their first game a box would appear explaining that they can have a free 30 days.

This is an interesting idea.  It puts the noob in the driver's seat.  It's one more button to push, which represents one more 'level' of commitment/interest (as inconsequential as it may be).

It could be effective because most people who just want to join a game and see if they like it (and perhaps not finish the game) are less likely to take the time to go through the settings.