Because it'll put more strain on anet's servers than what they already have right now. It'd be great if they could let us observe all our previous matches, but getting one is better than nothing.
Look on the bright side, if you're a top 100 guild and you play at peak hours, your game sometimes gets bumped off before you even finish a long match, which means you have no chance of seeing the match at all...*cough*monthly tourney*cough*
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