Where does it say you can, in the books or the SRD? Or the errata for that matter?
Use some common sense, people!
Think about it:
1) The books and the SRD don't have ANY mention of allowing stacking the same Metamagic Feat.
2) The ELH introduced feats that, if stacking the same Metamagic Feat on a spell were allowed, would be utterly and completely useless.
The only thing that helps your argument is this:
3) Some already released errata and clarifications have indeed made no sense whatsoever and have clashed with the rules in and of themselves.
So on that note, it is indeed possible that they did soething this stupid. The chances are equally good, however, that they did not.
Use some common sense, people!
Think about it:
1) The books and the SRD don't have ANY mention of allowing stacking the same Metamagic Feat.
2) The ELH introduced feats that, if stacking the same Metamagic Feat on a spell were allowed, would be utterly and completely useless.
The only thing that helps your argument is this:
3) Some already released errata and clarifications have indeed made no sense whatsoever and have clashed with the rules in and of themselves.
So on that note, it is indeed possible that they did soething this stupid. The chances are equally good, however, that they did not.