As for drinking: ibid. abaici. I only wear 'nalia at specified Sorority/BGLO or community service functions. This was true even as an undergrad. Since I do confine my 'nalia wearing to AKA or other BGLO functions, it's not an imposition to conduct myself in manner befitting my Sororal affiliation. It's a pleasure.
As for gambling: if the sorority was against it, why would it set so many of its conferences in places like Vegas? Additionally, my chapter is having its retreat in Reno, NV. Why go there except to gamble? I don't gamble, have never gambled, and don't plan to start gambling (and would have chosen a different setting for the retreat), but, to each her own. There are some golden Sorors in my chapter who LOVE to gamble.