From What are ChessCube Cubits?
What is it?
Cubits are ChessCube’s virtual currency, which can be used to enter a ChessCube Tournament, play a wagered Chess match against other ChessCube users, or purchase items in the ChessCube store
How do I get Cubits?
Directly purchasing Cubits using your Credit Card or Paypal account
Using your ...
Don't play too many games if you don't have cubits or you don't want to buy them. Just play one a day for your daily bonus. You generate 100 cubits a day so 100*10 days nets you 1000 cubits.
Only play lots of games that you bet on if you know you are good.