We recently spotted this inventive sweepstakes offer by Local Media Insider. Not only can you enter to win a free iPad by signing up for a free trial, you can also refer a friend, and if that friend wins, so do you!It’s a nice way to get B2B referrals and opt-ins for your list. The problem may be in retention. Sweepstakes hounds, like extreme coupon clippers, will be willing to sign up for a free trial of anything and then cancel their subscription after the drawing.A more savvy approach might be to offer the sweepstakes for people who pay for a reduced price trial period — say$1 for 2 weeks? That way you’ve jumped over the pay hurdle and begun cultivating a relationship with people more likely to be genuinely interested in your content. When it comes to opt-ins, numbers count, but so does the quality of your leads.