You're not allowed to gift Master clubs, even if it is from Master to Master, due to multiple-account holders (yes, I know, they just take all of the fun out, don't they?).
Example: Someone gets to Master, and decides they need more money. They start a new account as a Hack, and start winning lots of MPC or Ready-Go's over time. With this money, they gift clubs to their other account. And volia! Free* clubs!
*Free except for the price of the Ready-Go and the lost MPCs, as well as all of their honour.