Although you can buy many upgrades with TC, be careful what you buy, once you buy something it takes off how much the item costs.Also, try not to trade ingame cause most of the people are scammers so don't even bother...
-If
ANYONE tries to scam you or ask for your password, take a screenshot and tell an administrator for help.
If you want to earn more Tc, try buying it from here
Buy Toricredits
If you want a booster,which gives you a certain amount of TC Per win you make Click this link
Buy Paypal Boosters
But, these costs real money..
If you want to get free TC, try winning tournaments, betting, Specific servers which you can find in game on multiplayer,or surveys.
If you are intrested with surveys, you could click this link
Earn Free Toricredits
Try to keep away from surveys as much as possible though, on almost all of them you have to download something which usually plants viruses on your PC.
I hope I helped you with this thread...