Why is nobody using the Sigma dSLR with the same sensor?
I think it's because you can get the DP2M and DP3M for $1,800 with very high performance lenses included, while the DSLR is currently $1900 (normally $2300) and is limited to Sigma SLR lenses, which don't seem to be even close to the DPM lenses, except maybe the new 35mm f/1.4. Also the functionality of the Sigma SLR isn't so great compared to a Nikon or Canon.
So people who are skeptical or new to Sigma will want to test the waters with a cheap "point-and-shoot" (except it's not a point-and-shoot, it's more like a secret weapon). LOL