I go to LAS often, and even in good times, as you deviate from center strip (Bellagio, Caesars, Ballys-Paris) the crowds seem to decrease. South of MGM (since there are only 4 casinos: Trop., Excalibur, Luxor, Mandalay Bay) the decrease is even more. I stayed at MB, this past weekend, and the slots were not heavily used. MB (at least for the weekend of 3/6-3/8) seemed to have groups in their early 20's with lots of cases of beer.
[But, if someone passing through plays $3.00 for a few minutes, this is not a "money maker" for the casino.]
PS: The tram from MB to Excalibur was not in operation, so maybe fewer people ventured as far south as MB.