Security ... think about it!
As they went to sit down, I noticed the bottom of OWB holsters as two of them sat down and the chair back caused their cover garmet to ride up a little. One guy with a pullover windshirt on was 'feeling' for his gun and noticed his holster was exposed that way and quickly pulled his shirt down as he glanced around to see if anyone had noticed. Another made a clearly audible clunk as a handgun clearly hit wood on the chair as he sat down.