Hey guys, I know the driver-war has become a thing these days. But using more drivers actually does have some benefits. For one, you could reduce the overall distortion in the IEM. Reducing distortion helps with better transient response, improved resolution and better treble extension. Also, it allows for finer tuning than of the spectrum. I know some IEMs, despite having a fewer driver count are able to perform to the same level as IEMs with 14 or 18 drivers. But it comes down to each manufacturers own approach or recipe to squeeze out that last bit. For example, consider the hyper cars from Bugatti, Pagani, Shelby Supercars, Koenigsegg. They all follow different approaches to engine configuration to get the ultimate performance.
That said, I don't think that these multi-driver IEMs are priced strictly based on cost alone. I think these IEMs are priced based on the relative performance and not necessarily the cost. Meaning, if a company creates a new IEM, it. I also think that when they use too many drivers it helps them justify the price little bit. Remember the Noble Savant fiasco? People really enjoyed the IEM and sang praises until they learnt that it was a 2 driver IEM. They weren't happy that they had to pay $600 for 2 drivers.
If I may also make a suggestion. When you are in the pursuit of ultimate performance, rather than investing crazy amounts (like above $3k) on IEMs, I'd recommend you look into headphones and speakers, if your lifestyle allows it. Sure the perceived resolution on the IEMs like Zeus or U18 cannot be matched by headphones and speakers and they cannot be carried in your pockets. But what you get in return is the size of the musical and instrument image, that sounds less compressed and more life-like, that is equally rewarding in a different way. Headphones and Speakers are larger rabbit holes than portable audio. But for the amount of money you spend, the benefits they provide can be more apparent.
Just my $0.02.