Increased on-chain transactional privacy. Education. Being a good community member. Assisting the network that is assisting you. Those sorts of things. Come join in, it makes you a true citizen of Bitcoin with a small but important vote in the future direction of the network if you actively select your node software/upgrades.
Discussion
Thanks. I may get there eventually (running a node) but my concern is that economic incentives (like for mining) are far more reliable for motivating people to behave well than asking folks to do things to be good citizens. Ideally we'd all want to be good citizens but I'd be far more confident about it all if there were economic incentives to run a node.