It's described thoroughly in the 'transfer rate' thread.
http://forum.trackbase.net/threads/4...ull=1#post5442
Read it closely
If we would follow your logic, someone can have an old account with 22 rating and wants it to add up to his new account which has 25 rating.
That would result in a 47 rate for that new account.
We're not adding any rating from old to new accounts, we're transferring it