Expensive and not fair game
The game developers are greedy. They will rob your wallet changing game rules to make you pay more for everything.
Just go and look for flustrating players posts on their own SWC Disney forum.
One day your units need 5 minutes to build , next day 10 minutes. Want to make it faster ? Pay. Want airstrikes ? Pay. Want droideka upgrade to level 40 ? Wait one year or Pay. And The ingame purchases are expensive.
Old trust about
Star Wars™: Commander, v3.5.0