In recent years cork has come under pressure from other wine closures. Market studies in the United States show that consumers prefer cork closures in their wines and it is an important factor when choosing wine.

A 2006 survey of the U.S. wine trade found nine out of ten consumers – a stunning 94% – think that non-cork closures sometimes or often cheapen a bottle of wine.

A 2005 closure survey by the Wine Spectator showed 81 percent of those questioned in an Internet survey preferred cork closures compared to 18 percent who preferred screw caps.

In 2004, Wine Intelligence, a leading international wine industry consultancy, conducted a major survey of American consumer attitudes to two types of seals: cork stoppers and aluminum capsules (screw caps). Two-thirds of the respondents preferred cork stoppers, 52 percent rejected aluminum capsules, and only one percent said they did not like to drink wine sealed with a cork.

A 2002 study by Moulton Hall to monitor consumer attitudes toward natural cork stoppers and other wine bottle closures, found 76% of the consumers preferred cork. (National percentages were the United States 80%, United Kingdom 78%, and Australia 71%.)

The Australian Wine Research Institute carried out a comparative test over 24 months, which determined that natural cork on the whole was the best product to use for aging wines.