There are also a fairly large number of conventions. Some companies used to hold corporate manager meetings in LV as well. I still think it's a place where spouses wouldn't mind taking along if the trip is extended by a couple of days.
Casino's hold no excitement for me, I tend to be picky about expensive concerts, Blue Man Group...been there, done that...next. I've been to the Valley of Fire and the Grans Canyon.
Spending a couple hours at the ballpark while the wife is suffering thru another corporate dinner or meeting beats hanging out playing quarter slots because I'm old and cheap.