Question

how often is 20 ccs given to a player

???

Answer 1

You can get given 10, 30, and 40 CCs for completing the various requiremnets of some of the Quests (see the vlue book icon to screen left).

You can also get CCs, from Admin, for reporting bugs.  Not notrmally 20 - usually 5 or 10, so I think it'd have to be a pretty major bug.