If the numbers seems disappointing to some people, I think they may have had an unrealistic view of the overall "state of the nation". And it may have been because I had a more "realistic" view of the Amiga situation in 2011 (there is *no real market*) that I think this graph is *excellent*!
And you can read out a change in the trend as well; like how *the slope* of the curve chanbes after the Mac support was introduced. Cheap and easily obtainable hardware (although still PPC)! 
Yeah, I'm actually quite surprised that there are over 1,100 registered users. That is quite a bit more than I would have expected. And yeah, the jumps for each supported hardware added do show that there is interest there. Even for an OS that costs more than the hardware it's running on. It's very interesting. I've ALMOST bought MorphOS a few different times, myself, even though I really don't have any idea what I'd use it for.
(And I do agree with a previous poster, and I also suspect there are more 68k users than all MOS, AOS4, and AROS combined. (A lot of people isolated by distance, language, etc.))