Cork also has the problem that it can occasionally spoil the wine. (http://en.wikipedia.org/wiki/Cork_taint http://en.wikipedia.org/wiki/Cork_taint) My underst

Cork also has the problem that it can occasionally spoil the wine. (http://en.wikipedia.org/wiki/Cork_taint http://en.wikipedia.org/wiki/Cork_taint) My understanding is that twist-off caps are strictly better for wine, but the inertia of tradition has kept most wines sealed with cork. (It doesn't help that cheaper wines were the first to switch and so twist-off caps became associated with cheap wine.)