[Engaging personal-opinion mode]
Personally, I prefer the tokens system to a flat-sub rate. Sure, with a sub system you get whatever gets released as part of your subscription, but that doesn't necessarily mean a good deal. What usually happens with something like that is you may get one or two months where a bunch of cool stuff gets released, and then you'll have a long drought with nothing interesting. So it seems like you're getting a good deal on those months that see a lot of content, but then you feel majorly ripped off on months where nothing good comes out.
Also, typically with a sub system, once you stop paying, you lose access to the games. Tokens let you spend them when you want, keep them for a pretty long time, and the games you buy are yours forever. There's no loss of access etc.[Disengage personal-opinion mode]
And to G.W Swicord's comment on content on TGN...
Check out Sins of a Solar Empire, a 4X RTS game developed by Ironclad Studios, and published by Stardock. It'll be both in retail shops and available for online purchase via TGN later next year. It's still not quite in beta yet, but it's a VERY promising looking game. Definitely AAA quality stuff. Also take a look at Space Rangers 2, which we added to TGN just last week. It got some pretty solid critical praise and is worth checking out.
We're growing our library, it just takes some time