It's not really taboo depending on what it is.
Cumming,Ga is not far from me at all so I know the area.
Most people don't put commercial listings in regular gamls and fmls because it's not needed. If it's a small piece of land or a small building thne yes you might find an interested buyer there.
If you are selling a business and not real estate then
www.bizbuysell.com is where it's at.
If your selling office space
www.cityfeet.com is a good one and there is also Dorey's first cls.
If you are selling land for assemblage,retail,industrial etc. or selling tic's www.loopnet.com,and
www.costar.com is where most list at along with networking.Big deals aren't usually regular buyers but developers and institutional investors etc.