68k is by far the biggest part
That might be true, but how many of the people still 'using' m68k-amigaos belong to the target audience of a software developer?
Software development on 68k completely died down a decade ago. What was released after that is either a port of something maintained by outspoken PPC supporters (YAM, Wookiechat...) or written in AmiBlitz - which means that due to the limitations of the compiler, there'll always be a 68k built even if the developer doesn't care much about 68k (i.e. HD-Rec). As a platform for desktop users, 68k is in much worse shape than AmigaOS 4 or MorphOS. As in: "Even more dead".
A m68k port of AROS is nice for creating free/libre emulator distributions without depending on AInc. And it's a good gimmick for those people who collect, repair and polish old hardware and then want to have a shiny Workbench environment running on it that almost looks like it belongs to this century.
For everything else, m68k-AROS simply appeared
way to late - which seems to be the common theme for AROS in general. If AROS would have been there when Amithlon took shape, the Amiga scene might look very different these days. But it wasn't, and now it's 2014.