For those who have the "concealed is concealed" and/or "how would they know?" attitude, may I ask:
Why should anyone respect your right to keep and bear arms while you declare abject disrespect for their property rights? What does having such an attitude say about your character...?
But that's not really what the OP asked. You're bringing into this a side issue -- that's been debated many times before -- about what you suspect "many here" might do IF.The issue, as I have tried to point out, is that there are may here who would see the sign and in places where it doesn't carry the power of law would carry anyway because "concealed is concealed" and the property owner would not know. This is not how respectful people act.