Had a look at that thread, and just want to repeat this one:
Does a miner have choice for his reward ?
Yes.
The protocol allows the miner to claim any reward equal to
or less than the sum of the block subsidy and all the transaction fees of all the transactions included in the block.
There's also a bunch of "no known private key" addresses ... it's not 100%, but those can't be spent either. 1CounterParty, 1xxxxxxxxxxxxxx, the "zero" address", ... (heh, yes I know you can't prove it, but pretty much someone somewhere out there is trying to, and they'll fail.)