IMO, GLA has the best money making structures.
USA- Slow income, but big amount of cash at a time, Supply drops Are even slower income which doesn't help the USA at all. All tho some people use the supply drop zone exploit, even then they cost too much to make enough to have a constant cash flow, while making units.
China- Mid speed income at mid cash at a time, Hackers are virtually useless, 1 internet center + 8 hackers= $50,000+ and in about 2-3 minutes you STILL don't get the money back that you paid for them, even having individual hackers scattered through the map isn't cost effective, wasting valuable money just by getting up and moving, then sitting down. And also they are hard to protect form any kind of attack, just one GLA sneak attack can kill all your hackers, making them a total waste of money.
GLA has the best money making units. The fast income and little money at a time is perfect for GLA's type of style, which is fast attacking, and big numbers. GLA has about $375 at the time the other 2 factions have their first load, then they have about $900 on china's second load, and over 1200 on USA's second load. Not only that, but the black markets are very cost effective, Giving $25 every 2 seconds or so, making the hackers seem so un cost effective compared to them (u can buy 1 black market that is hard to kill for $2500 and get $25 every otehr second, or buy about 3-4 hackers at same cost and get only 15-20$ every other sec MAX, on top of that, they are so easy to kill it's not even worth it.) On top of all that, Black markets are hard NOT to buy, because GLA can get teched units from it, so basicly its as if they're buying a strategy center and getting free money with it.
Email me if you ever need help (edited signature November 6th, 2014)