The purpose of virtual-monitor devices is to help you achieve a mix via headphones that will translate properly to speakers - not to improve quality in a headphones-only world.
Personal opinion, based on pure speculation: virtual-monitor devices are a waste of time and money for most people, the only exception being those who have literally nothing other than headphones to mix on. And who doesn't have at least a car stereo or boombox as secondary references?
As others have pointed out above, you'll be mixing in a totally unique environment that nobody else will ever experience.
Of course, the above statement can be applied to any mixing environment. Nobody else will ever hear exactly what you hear, whether you're using $5 earbuds or high-end monitors in a well-treated room. Headphones in particular will always present a particularly specific listening experience, because no two models are alike, and even the best of them aren't as flat as good speakers.
So how do pro mixers deal with this quandary? They monitor in as neutral an environment as they possibly can. Flat speakers, medium volume, minimal room resonances.
This is the only practical strategy, to shoot for the statistical middle. Sure, nobody will ever hear your music the same way, but all of their various deviations will orbit around your neutral center. And if your mix sounds good on speakers, it will also sound good on headphones. The reverse, however, is not necessarily true.