There's that, and the dealers often get too used to large tips on large wins, so they get nasty with you (or are just quietly rude) if you don't tip them "enough".
I used to tip the dealer $5 every so often. This wasn't for any +EV purpose. It's a myth that dealers increase penetration when you tip them. It's also a myth that they report you for card counting if you don't tip. But I felt that these dealers depended upon tips for a living, so I didn't want to stiff them.
However, I would have a $300 hand which splits and then doubles, and it would all win for $900. So I'd throw the dealer $5, and they would look at me like I'm the biggest asshole in the world.
I noticed that the recreational players were tipping $25 minimum in these spots, and I realized that my tips were being taken more as an insult than something nice.
So I just stopped tipping altogether at BJ.
Then I read that the dealers at the high end properties where I mostly played were making $90-$100k per year anyway, and I felt a lot less bad about stopping tipping anyway.