None of those are really "omg we need some more of you for our guild raids" classes.
Chanter is most reliant on charm so if you don't want to charm much, they're a poor choice. They're probably also the least needed in raids given the large numbers of them on green and teal compared to the 2-4 you need for a raid.
Necro and druid don't have huge raid rolls (puller for necro maybe?), but both are versatile soloers. Druid versatility helps groups/guilds more I guess, with ports being great in classic and kunark and heal potential in raids. Necro gets the edge for solo in dungeons since they have options not requiring animals or outdoor-only spells?
/shrug
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