And then, there are players like me, I work and play other games, I pay subscription, have no issue with money and can gladly buy "subscription token" to put on GTN for a month worth of credit farming.
You're happy, because you got "free" sub, I'm happy, because I have some credits to play with despite my lack of time to play and farm it myself.
There isn't really a harm in this, someone would have to buy that sub first after all, if anything, the prices would be incredibly inflated on the level of Satele robes on GTN.