Because they are staff.
This forum is aimed at tech support and being friendly in general. Mods are usually exception or active in both of those areas to some degree. When you become staff, you are then the target for trolls and abuse of all sorts, plus you have to take time to deal with spam and reports. (And you have to do all this without abusing the power)
The coloured names (which I don't have), the custom titles (which are also available for those with 3500+ beans), a longer sig and less restrictions on avatars are not compensation for that, but they do lighten the load.
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