All... to answer your question further... tanks, jeeps, etc. need pilots or drivers to control them. And pilots and drivers need to eat. Even your general consumes food.
ADDITION:
Another poll time:
Should I allow players to buy lieutenants?
•Yes
•No
Description: When you enter a battle, you can choose to send either a lieutenant or a general to lead your army.
If you send your general and lose the battle, your opponent will be given two choices: Let you free for either
•Money(500 gold per battle victory and the reason is because the more victories you have, the more important you are to your team which makes you a "valuable" person)
OR
•For all your upgrades(upgraded transport truck, etc.). This means you'll lose all the upgrades you have and your opponent will get them
So if you want to send your general to lead your army, it is best that you are very confident you can win or you'll suffer heavy losses.
For lieutenants, they have no bonuses but, if you lose the battle and you chosen to let lieutenants to lead the battle, you will not suffer any losses.
The disadvantages of lieutenants is that all the units receives no bonus or bad things expect for one: All units have only 65% HP
Also, lieutenants' stats are lower than generals.
Another disadvantage will be that they cost money(For training courses, etc.). Lieutenants cost 10000 gold each.
P.S. If you lose a battle against the neutrals and you used your general, you will not suffer any losses.
ADDITION:
Now, not only do you gain gold from kills, you will gain 25 gold every turn per city and 100 per city. And to add more fun, you can actually "upgrade" the amount of gold you get per turn.
First upgrade-City: 35 gold per turn
-Capital City: 110 per turn
Cost: 7000 gold
Second upgrade-City: 50 gold per turn
-Capital City: 125 per turn
Cost: 10000 gold
Third upgrade-City: 65 gold per turn
-Capital City: 140 per turn
Cost: 15000 gold
Fourth upgrade-City: 80 gold per turn
-Capital City: 160 per turn
Cost: 19500 gold
Final upgrade-City: 100 gold per turn
-Capital City: 200 per turn
Cost: 30500 gold
ADDITION:
Just to clarify some matters, lieutenants DO consume food.
Also, at times, riots will occur at cities. Therefore, you should put some guards at cities sometimes.
To do so, simply move next to a city and move your chooser to "Put Guards" and you'll be able to choose how many and what units you want to be guards of the city to prevent riots. Of course, the guards will fight the other players if the enemy player walks near the city.
ADDITION:
Upgraded transport trucks cost are now changed
From high templar to infested kerrigan, it costs 10000 gold
From infested kerrigan to hero zergling, it costs a hell lot because zerglings are very fast... 35000 gold
ADDITION:
Although upgrading is good, you have to decide very well when to upgrade, if your army is too small, it is best you buy more units first but if your army is very big already and you have extra money on hand, get upgrades. And yeah, I know there's a lots of...
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ADDITION: