Sell, as in RMT?
Because EP/Extension choices are very important to performance, how would this not be P2Win?
What I mean, is currently if you want to get Adv Robot 10, you have to 'save' enough EP to do so. During that period your saving EP, other players can advance to level adv robot 7, leaving only a small gap in performace.
With tokens, you can freely spend 100% of your EP, then pay to down-grade as many extension points as needed to pay for lvl 9 to 10 immediately.
Not to say that wouldn't be expenisve, but that's the way P2Win works, the player with disposable income would be able to operate their agents at 100% applied EP, which, when level 10 extensions can cost 45 days of EP, is a significant advantage.