That kind of fee happens when you collect a lot of micro payments. When you collect a lot of these at the time of you transferring your btc, you have a lot of spending inputs therefore the transaction size in byte or kbyte is bigger and the fee is bigger depending on transaction size. You cannot do anything about it for the moment. You should try to withdraw only bigger amounts from where you earn your bitcoin. You see when you have only one transaction and you have withdrawn let's say 0.10 btc, and then soon after you spend this money the fee will be about 0.001 bitcoin maximum.