I am pretty sure Blizz intended for the 30% buff to work the way it did, give a feeling of accomplishment to those guilds that can clear content without the buff, and then gradually make it easier so the majority of the player base can play deeper into the content.
It seems to me that most of the people who want everything to be uber hard all the time know nothing about how a business model works. Go create your own really hard MMO and see if you can get 12 million people to pay you $12-15 per month to play it.