So you haven't tried a space based MMORTS yet? Whilst waiting here you could try Boundless Planet, Time of Defiance, and Beyond Protocol. All have demos or are in beta. Mankind is available too but no demo - complicated story.
I am interested in fee's also - the current vogue is free to play with pay to win addons. I say pay to win , as MMORTS is hugely complicated balance wise and the constant new additions to released games upsets and invalidates a lot of the balance testing done in beta. So released updates that involve purchased items tend to swing wildly balance wise.
I would expect constant updates though as this is expected of MMO games.
TIP OF THE DAY – If you're being chased by a police dog, try not to go through a tunnel, then on to a little seesaw, then jump through a hoop of fire. They're trained for that.