Gidday,
A friend and I contemplated the idea of a Blue Mountains herp society about 4 years ago.
A society relies on members so it just needs to be determined whether there would be enough interested people to join.
We thought about raising the issue at local herp societies to measure numbers of interested people but figured we may be accused with poaching members.
If you do consider starting a group up you have my full support.
Cheers.