Originally Posted by Alrik Fassbauer
I'm playing DDO since last October, and you can get through it without paying something imho quite good.
But, however, there are many additional "adventure packs" - some worthwhile, others less - that you can buy for those "Turbine Points" (Turbine is the developer), which you can buy in shops or online, so at one point I decided to "pay them back" for the fun they gave me by playing their game so that I have bought such a "Points Card" twice now.
And this is - in its essence - their business model - apart from the "VIP" thing, which is nothing but subscribing, as far as I have understood it.
By buying those "Points" (meta-currency), you become a middle thing between F2P and VIP : It's called "Premium", and it has a few more positive sides than just F2P, although not that many. For example you can have more characters per server (Premium : 4, F2P : 2).
I assume that other F2P games have similar business models.