From the way you described it oringally Miz, I did not see your H as having a gambling addiction. There are certainly people out there who look at "games of chance" as a viable business.
Certainly though, if there's a measure of obsession (in anything) it could certainly be an addiction risk.
There's many "'holic" support groups that focus on these obsessions that have become hugely negative in these people's lives. From work to porn/sex to drugs to alcohol to work to...
My only thought is, like any sound business choice, that there are clear boundaries around what monies are used for the business and how the profits for that business are to be spent in positive ways, including wages. And... that your H has an exit strategy and "knows when to fold 'em and when to walk away".
