Ya's cain't force people's to participate...
Seriously, I suspect most folks here have HO, N, G, or Z as side interests from their O gauge hobby. I'm pretty sure there are other venues where participation of modelers in these scales is hot 'n heavy.
We also have a fairly low participation rate on the S scale forum here. But, I'm glad the folks over at OGR have allowed us forum space.
Rusty