I very much like Pat's closing comment: "In fact, many buyers are actually asking to be bamboozled: They'll take fancy veneer work and jewelry-store spikes on a third order design with and a vertical baffle !!!!"
To update Pat's commentary, technology has come to the rescue on a couple of fronts in recent years. First is the coincidental driver (tweeter inside the woofer with the voice coils lining up in all three dimensions. This is found in KEF's better speakers. (Note that coaxial drivers do address alignment in two dimensions.) Second is the advent of DSP (as used in an increasing number of active speakers) that can adjust for phase, impulse, plus of course compensate for the given room, and serve as the crossover. This can be also be found in software (Room Equalization Wizard, Dirac Live, etc.) if you listen via a computer.
But DSP is only a bandaid. The best solution is to go back to Pat's fundamentals and start with quality drivers that are physically aligned and use first order crossovers, then tweak with DSP. Just like with room acoustics, start with a proper shape/size of room with a good setup, then tweak with treatments first, then finally room EQ.