This is not new. But I suspect that they just want to be able to say no at their discretion. I take it as their version of the right to refuse service to anyone sign in a restaurant.
http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1258638486&openfrom&5&4#5
http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1258638486&openfrom&5&4#5