Spark plug burn marks, normal? 2019 CX-5 GTR

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19 CX-5 GTR White on White
Just changed the plugs, 35k miles. Are the burn marks normal? All 4 plugs were the same.

Looked closely under a magnifier, didn’t see any cracks, just the discoloration.

It’s been a while since I have changed any plugs, however I don’t recall seeing this before.

Thanks.

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Cost to produce, and price are very different. Mazda needs their profit, plus they need to be inventoried, distributed, shipped distinctly and have a much smaller adressable market - since nobody but Mazda owners will buy them.
The profit margin should be consistent among all ORM parts. Car manufacture won’t be doing something like putting 100% markup on spark plugs, but only 25% on oil filters.
 
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