Group-buy deals, by means of Groupon or any other website of the sort, are an expansive marketing tool these days. It seems every respected business tried group-buy to leverage its profits, at least once. Thus. e-commerce can use it and use it as well. With even larger success than an offline business. Obviously a group-buy can turn out either great or not terrible, but it all depends on a good business strategy.
If there appeared a question mark over your head, I suggest following a few pieces of advice!