afterall naxx is supposed to (and is) a very easy raid in both versions. it is supposed to teach everyone the basics of raiding to then progress onto newer (harder/challenging) content.
therefore i doubt it is intended to run heroics with mains any longer except for the actual items that drop there - not the badges.
whenever talking about causuals, dont forget to mention the boe drops from raidbosses. they should be available on the AH and getting cheaper as the content progresses - this is a nice solution for filling faps in your gear.
another interesting thing would be to change the iLvl200 badge gear to BoA as soon as ulduar gets released. thereby it doesnt matter which of your characters you use to farm them, so e.g. your guilds main tank would continue running instances with alts to equip his alt etc.
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