[ikeboy]

No, it's proportional to the value of the coins used as reward. If there's high turnover, that might lead to bitcoin's price increasing and therefore higher energy costs. Also, high turnover may lead to higher fees, increasing the reward.

If the high turnover is done between trusted parties, or with settlement time, then it doesn't matter to security. It needs to be people accepting large amounts from strangers/untrusted counter-parties and giving stuff for it immediately. But usually, if I send someone $1000, they can wait 3 hours for security.

>Also, when a bank charges me 1% for a wire transfer, they pay salaries from that money and some people buy food.

When a bank has lights on, burns fuel to send an armored truck around, etc, that's also wasted.