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You should use 0.19 gold training every day. Here's why.
With Natural Enemy bonus, 2 invited friends and daily tasks, you'll gain 8 strength per day. With the 0.19 gold booster, you'll gain 10.5 strength per day.
Since it takes 250 strength for a Super Soldier medal, you'll get a SS medal every 24 days. During that 24 days, you'll spend 4.56 gold on training. The SS medal gives you 5 gold.
Therefore, you actually make gold if you use the training booster. Plus, you'll have more strength and do more influence in battles.
Also, there have being proposals (by me) to have a government-sponsored program to give everyone 0.19 gold per day.
Shameless plug: If you don't have 2 invited friends for +1 strength bonus, I can provide legit referrals - players who have never heard of erepublik before. PM me for the price.
Since it takes 250 strength for a Super Soldier medal, you'll get a SS medal every 24 days. During that 24 days, you'll spend 4.56 gold on training. The SS medal gives you 5 gold.
Therefore, you actually make gold if you use the training booster. Plus, you'll have more strength and do more influence in battles.
Also, there have being proposals (by me) to have a government-sponsored program to give everyone 0.19 gold per day.
Shameless plug: If you don't have 2 invited friends for +1 strength bonus, I can provide legit referrals - players who have never heard of erepublik before. PM me for the price.

Thanks lailai a very good point.
I saw this as well, good to see someone else did as well
That is a very scientific method you have there lailai, now is that a ruler in your pocket or are you just happy to see me?
Sadly, I dont have 2 invited friends anymore. They gave up on the game after V3.1
I dont think I can bring my friends to play this game now, the game is getting worser by the day.
ಥ_ಥ
ADF have been doing this for sometime. Great idea, but its not new. Any new players wanna get involved, join the ADF to help you get started
I can provide legit referrals - players who have never heard of erepublik before. PM me for the price
multies rules....
In agreeing with venja, its a good idea to pay for the bonus to registered and active ADF members (this was started during my last term as CP, but it wasn't my idea). It should not be done for every random citizen.
@wally wilson: why not? The advantages are that our military power becomes stronger, more people will come to eAustralia because of the training bonus, and we could cut black market trading by requiring those who want the 0.19 gold / day to not trade on the black market.