that's why I want to know if there are more incentives I don't know.
No, the incentive is one. You confirm you own money. You don't need a third party to confirm it that for you. You're a true wealth sovereign who generates invoices and verifies that they're paid without revealing any IPs or connections with other addresses.
Now that's the main benefit for yourself. There are others too, but only for the network;
Here are a few ways that a non-mining node benefits the network:
1. It enforces all consensus rules on all transactions and blocks that it receives and forwards.
2. It provides a source of pieces of the blockchain for new nodes which wish to join the network.
3. It provides a list of well-behaved nodes for other nodes to connect to.
4. It increases interconnectivity, reducing the risk that the network becomes fractured.