I refuse to go into a gun store unarmed, that's just plain stupid, "I'll sell you a gun but you can't carry in here" Yea right.
Unless it's a legal sign I ignore it, you will find most of the signs like those "no loaded guns" signs in gun stores are just idiot signs and they are not smart enough to read them.
Legends posted one of those signs, I went in and ask about it and was told "it's for the cowboys, not our regular customers" seems they had 1 customer come in open carrying a 1911, big shiny, pearl grips and all, pulling it out to test fit holsters, asking about this and that, the whole time waving it about. He was escorted out and told he was welcome back but his loaded gun was not.
I have been into a gun store that will not allow carry, said "good by, I won't be back" and never have.
The way I see it, and you gun store owners correct me if I'm wrong, if I am carrying in a holster (mostly covered) that is not the "loaded gun" you are talking about, you don't want some yahoo dropping a gun on your counter to 1. be worked on or, 2. to trade or, 3. to sell or, 4. to see what holster fits the gun the idiot shoud never have had in his grubby hands in the first place. Right?