I mean SG isn't that hard to come by...
I've only been playing since the PC Launch, already made near, if not over 1K Star Gems, WITHOUT Spending a single cent on the game yet.
The "Main Story" quests hand out a crap done of SG if you do them all. The mission pass hands out quite a bit of SG as well. Enough that "Should" be able to continously keep buying (spending 200 SG worth) golden mission passes, which in turn hands out even MORE SG.
Not only that, but if you finish the entire mission pass, and continue onwards from there, you get rewarded with even more bonus SG.
Yesterday/last night, I was down to around 70 SG left. Did some mission pass tiers, got FREE SG tickets from doing the Arks boost campaign and having it finished already, and I've bought yet another Gold mission pass, and am already over 100 SG yet again.
This doesn't really exclude that the way it's being handled/taken care of is poor, and I suppose I really only care about SG for the Gold Mission pass. This is taking into account I've already spent SG to upgrade my Tiers because I got bored of the tiers I was able to do only giving me one star (This was last mission pass), and I managed to spend an additional 520 Star Gems on the Dark Cloak.
Sheesh, I'm probably actually around what I said, 1K, if not more spent.
Anyways, just how I spend my stuff I suppose. Though this Gold Mission pass has a Lot of CAST stuff... Worth it to me.