The friends advertised themselves on the eBay site saying they would take a crate of beer round to any party and then stay.
"Not enough to drink? Want some new faces? Too many men? Empty dancefloor? Party always over by 11:00 pm? Always the same old dull couples?" they asked.
"Then get into a real party mood with our sixpack. We will personally bring the crate round. And the best thing is, we'll stay and party too."
When the auction ended, the highest of the 218 bids came in at the tidy sum of 25,050 euros, offered by an unidentified buyer.
"It started off as a gag," said Locki, one of the women. "It was a one-off and it's no reason to give up our day jobs," she told.
She said she and her friends suspect the successful bidder, known under an e-mail name blueemoon100, is actually a company looking for publicity.
"Everybody knows that the party we'll go to will be a media spectacle, so I am sure our hosts won't greet us in latex and leather."
She and the other women, who are called Nicole, Andrea, Steffi, Kerstin and Christine, are aged between 30 and 36 and come from Guetersloh, in the western state of North Rhine-Westphalia.
"We're being overrun by radio, television and newspapers! We never thought it would cause such a fuss," they say on a website they hurriedly set up after being flooded by e-mails. At one point the site crashed under the weight of hits.
