Why get involved?
The easy answer here is that you will be rewarded for doing so through "involvement rewards" and through "Any rewards" from providing liquidity, and if you already have FSN and FUSE there's surely no reason not to make the best use of them.
But of course being actively engaged in the voting does take some of your time, so possibly it is "not worth it"., and perhaps you have some better pursuit for your FSN with higher yield, or you prefer to stake it. Though I can understand this approach, there is also another aspect to this, and this is how lack of involvement looks for FUSE (in case you happen to hold some).
With FUSE it's truly possible to showcase that you're making active use of your tokens, involving yourself in liquidity provision and voting. Doing so is likely to make the token more attractive to "outsiders" who also might find it interesting to own some FUSE and to involve themselves in an active community. But if no one is using the opportunity to provide liquidity nor to vote, it becomes a dead token and even though it may have a market value, it won't really be something interesting unless it's being used.
So, this is the main reason to get involved! Do something with your tokens, so that we can showcase the value together!