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Why would a normal user want to launch a node in any mode other than "light" , does full or fast give any advantages in sending transactions ?

Is there any difference between transaction sent from full and light nodes ?

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There is no difference between sending a transaction from a light client or full node in terms of speed of transaction, as far as I know.

By hosting a full node however you are helping expand the ethereum network. Ethereum has come such long way over the last year that I think most of the benefits of running a full node no longer exist. If you did it its mainly because you are interested in Ethereum and want to participate.

What are the valuable benefits of having a node?

Can incentive be provided for non-mining Ethereum nodes?

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