It is undeniably satisfying though to turn all settings in a game up to maximum without performance tanking, but you and I (same card, but 1440p screen) are not the target audience. This is for people who want (and can afford) at least 4K with ray-tracing in the latest games and all of this at triple-digit frame rates - or they are actually using it for non-gaming applications: Even our old 2080 is a beast for tasks like offline rendering, scientific calculations, machine learning, etc. - and a 4090 is of course several times better at this.
I know this is going way off-topic, but I love providing a bit of perspective: The fastest supercomputer in 1996 was the Hitachi CP-PACS/2048 at 368.20 GFLOPS. In 1997, it was the Intel ASCI Red/9152 at 1.338 TFLOPS. An RTX 2080 achieves 314.6 GFLOPS at 64-bit precision (as used by the TOP 500 list of supercomputers) and an RTX 4090 1.290 TFLOPS. Granted, despite similar processing power on paper (and FLOPS being hardly an objective measure to compare vastly different architectures and systems), even ancient supercomputers still have modern GPUs beat in terms of the amount of memory alone (although latency is of course far worse): 128 GB (2,048 * 64 ~~GB~~ MB) in case of the Hitachi system, for example.
No, that's not why.
I mean, it wouldn't be cheap, but it would also be utterly nonsensical. So you put a tracker on a container and it sinks somewhere. Then what? First of all, this would have to be a satellite device (costly per container, then consider that thousands that fit onto a single ship), which needs sensors to detect it's going overboard and then send out its position before it's submerged. Maybe something communicating with the ship instead of satellites would be a little cheaper, but it's equally pointless, because the container wouldn't sink in a straight line and burst open long before it reaches the bottom.
Average ocean depth is 3,682 meters (12,080 feet). Nobody will go on a costly underwater expedition using one of the maybe ten or twenty civilian submarines on the entire planet (each worth tens of millions) that can handle this kind of depth without imploding to recover some soggy Chinese fast fashion garbage or crushed iPhones (because the pressure down there is about 366 times as much as at sea level - I don't think Apple rates their devices for that). Even if you do, you'd need a lot of trips picking up future landfill fodder with a little robot arm to get even close to getting all of the up to around 25 tons of former cargo.