So, just to make it clear, here are a few points:
What is sandbagging?
Wikipedia defines sandbagging as:
"Sandbagging (chess, Go, billiards or other such games), a player deliberately lowers his competitive rating, in order to play in a future event with a lower rating and consequently have a better chance to win."
Where does ChessCube mention that sandbagging is not allowed?
In our Acceptable Usage Policy, section 3, point 6:
"you cannot assist others by deliberately losing for whatever reason, including to boost their rating."
This sentence covers self-playing, Cubit transferring, rating transferring, or the intention of sandbagging (to lose rating points deliberately).
Sandbaggers that are active in ChessCube ruin the experience of honest players. So we are cracking down very heavily on this form of cheating - as this is best for the community.
Remember, you can report sandbaggers and any other form of cheaters to firstname.lastname@example.org.
More useful links:
Cheat Bounty - Report Cheats & Get Rewarded! - viewtopic.php?f=8&t=672
Bans for cheating - Country list - viewtopic.php?f=8&t=420