My first thought at reading the title of your post is that you couldn't have been at the fabulously fun & lively Deadwood Jam last weekend.
I lived in Deadwood for 3 years just prior to gambling being voted in and Homestake downsizing (mid 1980s) and, as mountainmama says, it was a dying town. Many empty store buildings with creeping decay, tourist shops that closed during the winter. Still half a dozen bars though. And, of course the half a downtown block on Main & Lee St. that was a deep dirt pit because the buildings had been destroyed by a fire in 1987--nearly burned the current #10.
Gambling may include greed, but at the same time, the cobblestone street has been restored as have the antique-look street lamps, no empty downtown buildings, much effort to bring in entertainment & activity, especially summer through fall.
None of the group I was with at the Jam did any gambling, so it isn't that I'm a big fan.
Reading your post I do wonder where your expectations came from.
As for the changed location of the #10 from:
http://www.roadsideamerica.com/story/8798
"Lots of real places and things in Deadwood are hard to come by, since most of the town was leveled in the great fire of 1879, or the medium fire of 1894, and 1948, and 1951, and 1954 (and whatever was left may have gone up in the great fire of 1987)."
Sorry your trip did not meet your expectations.