There is definitely a market for overbuilt drivers just as there is a market for muscle cars or any other extremes required in performance applications.
For those who say it isn’t worth it or it isn’t great value - you are absolutely right - this kind of performance is rarely or hardly necessary in most domestic homes. However, for those passionate about sound quality and ultra low distortion at realistic SPL then these type drivers are the ticket to a whole other level of ultra-high performance.
Oh, I very much doubt the sound quality of your "cheap Tekton DI" woofers will hang together when driven hard in the same way this driver will perform. At moderate levels you could well be right but there is high fidelity and then there is truly HIGH FIDELITY and sometimes the difference can be as little as 3% at moderate levels or an extra 6db to 9db in clean SPL.
A $50 eminence woofer (like in my guitar cabinets and stage monitors) is simply not going to be able to compete with this Accuton at $1400 but for sure the Accuton wont be 28 times better at 28 times the price. This shouldn’t surprise anyone who knows about these things -diminishing returns....