The fees for a SegWit address are lower than non-Segwit ones. Is there less fees per block with Segwit blocks? Is it less profitable to mine Segwit blocks?
A "segwit" block does not exclusively contain segwit transactions; it can contain both segwit and non-segwit. "Non-segwit" blocks contain exclusively non-segwit transactions because it does not have the requisite segwit commitments. Since segwit blocks can contain both types of transactions, it is actually less profitable to mine non-segwit blocks as you will be missing transactions that segwit blocks can contain.
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Plus more SegWit transactions for into a block and that block can become larger than non-SegWit blocks, so total fees are actually higher. – Jannes May 1 '18 at 12:51