NASA begs to disagree, showing Falcon 9 at $2,720 per kg and Falcon Heavy at $1,400 per kg [1]. This is the cheapest launch platform on the planet, apart from, perhaps, the PSLV [2].
And those are their prices, not costs. The runners up are Proton, Long March 3B and Ariane 5G at $4,320; $4,412; and $9,167 per kg respectively [3]. There simply isn't competitive pressure to push SpaceX's prices down. Particularly in heavy.
Ignoring the tremendous leaps we've made in launch economics over the past two decades, largely as a result of SpaceX, is naïvely dismissive. Yes, they talk a bigger game than they bring. But they're still bringing some big fucking game.
[1] https://ntrs.nasa.gov/citations/20200001093
[2] https://en.wikipedia.org/wiki/Polar_Satellite_Launch_Vehicle
[3] https://en.wikipedia.org/wiki/Space_launch_market_competitio...
The tradeoffs SpaceX has made have some real cost savings. Problem is that it's not anywhere even remotely close to what they want you to believe it is.