If you can't afford to invest much more in the long run i would not spend it.
The above poster is wise. If you happen to pull a chromium only toon or two and find yourself in a situation where you can level them, well, that road leads to frustration.
yeah it's a big investment, if your lucky to get a handful of the chromium only characters to 7*. all the othe characters its just helping you get them starred up sooner. But refills will help you farm up stuff quicker. Unless your willing to shell out ALOT of money if your hoping for the chromium only getting to 7* your better off just spending gems on energy/cantina refills possibly getting additional chances at hard quests of characters your tyring to collect shards for. I also like to nab shipment shards when they pop up with guys i'm interested in.
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The above poster is wise. If you happen to pull a chromium only toon or two and find yourself in a situation where you can level them, well, that road leads to frustration.
I'm just wondering where to spend
Like does 8x significantly increase odds
You could spend hundreds of dollars and not get a single other shard for them, you could spend more than a thousand and still not 7* them.
2 star leia , Biggs night sister.
3 star both rebel
4 star grand moff
And a few junk shards
LOL