If you ever plan to run regular raids with the same handful of people then yes you should be more "fair". After all, there's nothing worse than seeing one person win everything he needed in one go and then having him disappear the next week.

Well the point is moot. If your raids are successful people will continue to join. If you're a SOB POS ninja, word of mouth will just spread.

This morning after server reset I joined a VOA25 raid. No wipe at Koralon, one-shot down. But the raid leader / lootmaster went afk after giving the Koralon loot to the winners, and the whole raid stalled waiting for him. Finally a handful just left without killing Emalon & Archavon (including myself), pissed because he just went afk without passing leader and making 24 other people wait for him. He might have a real life emergency or something, but 20+ people in the raid swore to diss him out in the forums and in trade channel.

People are fickle minded. If they get a shot to get something they will flock to your raids, if they sense an unfairness in the raid they will just leave.

If you're relatively geared and the things you need only drops from Koralon, I doubt you will want to stay to kill Emalon and Archavon too just for the conquest badges.

Most people clear all of VoA because "oh well might as well do it since we're already here". If all three bosses are split in their own instances and lock outs, most wouldn't even bother with the older bosses.