The 1:1 correlation is simply the number of BTC to BCC you will get, not a value of any kind.

It is vital to understand that once the chains would split, they exactly that - Split - they are separate chains and there is no trading back and forth . .

There are certain attacks which would seek to do essentially what you are describing, but safeguards are being implemented against "replay" attacks, and of course "double-spend" attacks.

So hopefully now, if you picture 2 separate blockchains, one for BCC and one for BTC , with no way for coins to move directly between the 2 chains, it will explain things for you :)