The IIGS people were in pretty low numbers. On my BBS, I think there were only 2 users of that machine, and we really gave them a hard time for that! Mind you, Atari ST-bashing was far more fun, even if the IIGS people were very bit as adament that their machine was better than the Amiga.
And yeah, the previous Apple II models were far more popular. No idea why the machine was so unsuccessful...probably because they ignored the rest of the world? Regardless, they had as much shelf space here at the local Software Etc. as did the Amiga. Note, the ST had no shelf space.