Keeping the interests of mods and investors in alignment is important. However, if people can buy their way into a moderator position, particularly if they get to choose the community they mod, it would be extremely easy for bad actors to take over communities, such as those that promote political activism, or offer support for marginalized groups.

A much better option would be to only offer investment to moderators who have been active for a period of time / gained a level of trust with their community.