Fallen Sword [http://www.fallensword.com/?ref=1359876] has been using this model for years, with gold and Fallen Sword Points replacing dilithium and C-Points, respectively. Hunted Cow Studios is rolling in cash due to this, relative to the size of their company. It's given them enough money to make their own 3D MMORPG, Eldevin [http://www.eldevin.com/]. (Eldevin has actually always been their main focus, but they needed other on-going projects to give them enough money to make it. Thus, Fallen Sword, and several other browser-based MMORPGs came into being.)KyuubiNoKitsune-Hime said:Star Trek Online is actually a good counter to this problem. They offer two paid services that are both going to keep them competitive as an MMO and keep their profits up with out pulling that sort of trickery. Especially because they are going free to play. There you can pay for some account extras, or play for free with a little less. There is also their C-Store where you can get unique goods. Most of them are cosmetic, a few are better ships, or weapons or tribbles, but they're not totally necessary.
The other thing that makes their whole C-points thing good is that you could sell C-Points for Dilitihium. Which gave you the option of buying more rare and powerful equipment, but since there are missions that pay dilithium you could avoid it. The real beautiful part is that you can also hoard Dilithium and sell it for C-points to get the unique goods without paying a penny. Truly the right way to do things in the F2P enviroment.
As a Star Trek Online player, I'm glad to see that larger companies are finally realizing this model works very well.