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From my check its around 3000STEEM per month just holding the server... is that profitable?

AWS is rather expensive and I wouldn't recommend it for this purpose.

RPC nodes do not make any money, you might get some income from posts about it, or use your income if you're a witness.

So there is no motivation to contibute resources... how might the platform encourage resource contributors?

AWS is rather expensive and I wouldn't recommend it for this purpose.

RPC nodes do not make any money, you might get some income from posts about it, or use your income if you're a witness.