Just farm starbaces i got like 400k The farther they are the more money you get ;)
Viewing post in Event Horizon - Frontier comments
It's true though, this game is pretty good but it takes too long to farm and also the skill tree is very linear...for example I cant unlock Destroyer class ships without straight lining for it.
Makes progression slow and linear unless you find 'hacks' within the game like you said, farming Star-bases.