The only token grind in the game is the journey to 1k, where you seem to get fewer tokens per mission. The missions them selves are noticibly shorter however but no matter how you look at it more missions = a grind of some sort.
After this board most players wont need anymore untill the TL7 boards by which time, if you've kept up with doing dailies or pretty much anything else in the game, you'll have way over 2500.
My Trader has 6k+. He had the 1k board before dailies were introduced and has earnt 5k going from 196 - 216 by doing his dailies.
I'm very suprised that there is even a market for tokens.