I wouldn't look to the Poser galleries as an indication of what people are actually doing with Poser, any more than I would look to Facebook galleries to see what people are actually doing with Nikon DSLRs. Whether it's a camera, a 3d graphics app, or a home sound system, most people won't use anything beyond the most obvious features. That doesn't mean you shouldn't include features that more discerning or advanced users will be very thankful for or that those features aren't getting used at all.

My favorite character morphs are those that are custom made and based on real people (even if -- at full strength -- they are caricatures.) I mix these together to create characters that are very different from the ones each is based on, and the result looks much more like a "real" person. Or sometimes I begin with one of these morphs, and then add begin dialing to change the features from there. Starting with an asymmetrical base results in a more interesting face. But asymmetry is always going to annoy some people, so -- for the sake of maximizing usefulness -- I like it when content creators include both symmetrical and asymmetrical options. :)

Edit: As for M4 and V4 in the galleries, you're correct. The Morphs++ pack does not give a lot of options for asymmetrical morphing -- only the expressions offer one sided morphing. The actual shaping morphs, like cheekbones, jaw shapes, chin shapes, temple definition, and even things like lip and eye shape etc are all perfectly symmetrical.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.