yes due to the requirement by miners in order to get the transaction go faster even there are only ~4000 unconfirmed transactions as of this reply is posted, everyone is posting a higher transaction fees. unless the majority is lowering the transaction fee to use bitcoin, the .0006 fee is normal.
Can I choose not to pay it and willing for my withdrawal to be delayed?
If you are not paying for transaction fee expect that your transaction will be rejected or stuck in the blockchain..
But honestly the fee 0.0006 is small amount compare before that transaction fee is almost 0.002 btc before but right now was reduce that i think we can save bitcoin right now and i think this is because of segwit activation..
And the transaction fee is just a normal for any business. .