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Miners are paid in two ways - from creating new bitcoins and from transaction fees. The transaction fees are small but add up to enough to make it worth mining.

• wmf 13y ago
  If you do the math on a 1MB block that pays, say, 12.5 BTC of fees the result is pretty sobering. Like over $1 per transaction.
  • gibybo 13y ago
    I would wager pretty strongly that the 1 MB limit will be raised (or removed) in the not-to-distant future.