Why you may want to run a full #Bitcoin node.
1) You want to support the #Bitcoin network.
2) You don't want to rely on a 3rd party to validate your transactions.
3) You don't want to disclose transactions in your wallet to 3rd parties.
4) You're interested in strong security and privacy.
5) You're a developer building an application and need API access to the Bitcoin network. Wallet, mining pools, exchanges.
There are only 18,644 full nodes online around the world.