Inverted apps - why not more from devs?

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http://forum.xda-developers.com – I've found myself truly wondering why so many android developers don't seem to offer an inverted option for their apps. I mean, look at all the inverted apps that float around out there. I can't imagine that Google is doing it for the same reason that say, Facebook is - by that, I mean that it's a brand thing for many companies. For smaller apps, and ones where it really doesn't matter what the colors are (most of Google Apps are a good example), why don't the devs offer a light and a dark version at least? I suspect it would make a lot of users happy if there was a standard options for th (HowTos)