Network costs in Peercoin are not paid by minters, but by everybody who holds stake without taking part in the minting, because they miss out on the 1% reward. Unlike in Nxt, Peercoin does not reward minters with the transactions fees, but with new coins. Transaction fees get destroyed.
Also, I can run a Peercoin and an NXT client on the same machine, cutting costs in half.
Peercoin can also be run on a Raspberrry Pi, which consumes way less than $30 a month in electricity costs. I can also use a machine to mint that is running anyway for other purposes.