5 killer case studies of how Giveaways can attract thousands of leads. From someone unexpectedly attracting 187,991 new Subscribers in 11 days, making their website go offline with all the traffic, to an ecommerce candle store gaining 3,431 new subscribers (and thousands of dollars of sales revenue) within just 8 days, it's all here. As you'll see, the results of running giveaways, contests and challenges for list growth can be extraordinary.