If I buy Aeternity tokens on an exchange, I would then withdraw them to my eth-address right? In which case I would need to also buy enough ether for the gas price?
if you want to send tokens from exchange to on you ether address you don't need to buy eth
but if you want to send token from your eth address to an exchange
or to another address then you need eth for pay the gas price
If aeternity is a ecr20 token then yes, but this is not the thread for Aeternity tokens anyway. So i am not sure why you are talking about it.