wopwop is talking about the global costs, taking inflation into account. I guess he divided the value of the 25 BTC created every block by the number of transactions in a block. Those costs are real, only diluted among every existing bitcoin.
Since the inflation rate is already known and basically set in stone, I have a hard time referring to the new coins as "costs". Anyone who isn't trying to troll should have a hard time with it as well.
Displaying it as the cost right now is trolling, yes.
But the number is quite interesting, because it's the fee that a transaction would have, if there would be no block reward anymore.
$12 is probably way too much, so one of those things has to happen:
1) more transaction are included in each block
2) mining gets more cost-efficient (and that will happen for sure, like in every industry)
3) miners make less profit
