The icing is coming off America's cupcake craze.

The dessert became a cultural and economic phenomenon over the last decade, with gourmet cupcake shops proliferating across the country, selling increasingly elaborate and expensive concoctions.

The craze hit a high mark in June 2011, when Crumbs Bake Shop Inc., a New York-based chain, debuted on the Nasdaq Stock Market under the ticker symbol CRMB. Its creations—4" tall, with fillings such as vanilla custard, caps of butter cream cheese, and decorative flourishes like a whole cookie—can cost $4.50 each.

After trading at more than $13 a share in mid-2011, Crumbs has sunk to $1.70. It dropped 34% last Friday, in the wake of Crumbs saying that sales for the full year would be down by 22% from earlier projections, and the stock slipped further this week.

Crumbs in part blamed store closures from Hurricane Sandy, but others say the chain is suffering from a larger problem: gourmet-cupcake burnout.