You're the one that implied headphone jacks add cost to phones.

They do.

I'm saying that they don't, and whatever cost they do add is minuscule.

Ok.

The implication that any cost savings is being passed to you is laughable.

It is, but it isn't a major savings. But, it's hard to know because the pricing of phones isn't very transparent.

Look, they killed the jack because they could save a couple bucks of design time and get a few cubic millimeters of space

Yes....

most importantly they could softly force their users to buy wireless headphones

Why would they care?