XP

I really haven't noticed any real point to the tokens that you can receive as reading rewards. I'm not 100% certain, but I'm guessing that those tokens are the points that can be used in the store.

You can gain 60 points for 960 minutes of reading each week. But the cheapest thing you can buy would be a fast pass for 500 tokens.

And that's only for the first fast pass you buy which is considered as a "Christmas Gift." If you want a second fast pass, you'll need to pay 2,000 tokens and for a third one, 5,000 tokens.

Just take my word for it, and ignore that system. There is no way how that could ever be worth it.