It would hardly be akin to pay to win.
If someone gathered the gil through selling off materials and bought all that gear? Isn't that pay to win?
If selling one commodity is a legitimate way to get gil from another player, why isn't a time-token valid? Both need to be gathered in one way or another, both are available to players (some having more RL cash than time, some having more time than RL cash), and both need to be placed onto the market board for another player to buy...
The more people put up the tokens, the less the demand would be and one player may end up selling their token for less, which means they can't buy all of the gear they want. All an SQE Game-token system would mean is that a legitimate player gets game time out of the sale instead of a gil seller fattening their wallet.