In true classic (pre-2002) raiding, Necros were very gimped due to DoT stacking issues (ie: they didn't stack with other necros). This meant that having more than one Necro along on a raid was a waste, unless you could put them to other uses (ie: mana battery).
Prior to the patch on Sept 2nd, 2002, (right before PoP), The same DoT cast on a target by multiple players would not stack. I'm not sure how it is setup here on p99, but this, coupled with pet agro issues pre-'pet hold', caused a lot of raid leaders to favor Wizards vs. Mages and Necros. Since there aren't any stacking issues with straight up nukes, and they don't depend on pets for DPS, Wizards were considered the best form of caster DPS for raiding prior to this patch. A token Necro and Mage brought along for utility was often it
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