The answer to your question is that when you swap 10000yCRV, you will get 9933 CRV. This is because when you trade yCRV tokens, you will receive a slightly lower amount of CRV tokens in return due to the transaction fees associated with the swap. This is due to the fact that the transaction fees are taken from the amount of CRV that you receive in the swap. Therefore, for every 10000yCRV that you swap, you will receive 9933 CRV.
