I would almost say 100, 1000, 10000 as the costs for low, medium, high.
Tokens are the rewards we give for 'questing'.
Tradepoints are the rewards we give for repetitive, easy tasks, like trading. Some of these tasks are further away or more time consuming than other tasks, but they're all still repetitive, easy tasks.
I know players that have had 100,000 tradepoints, and a majority from lumberjacking alone. Because while I might be able to go out and gather tradepoints faster than Kvetch could with my knowledge of some of the faraway places, it's still just a trip through a zone gathering items, they will run out and the zone will need to repop. Lumberjacking is more consistent and pretty much goes forever. Tradepoints are great in that they are not aimed at any demographic of the playerbase. There are simply different speeds we can gather them.