Evaluating Giveaways as Attraction Offers for ReactSquad Leads

What do you guys think of giveaways as "attraction offers"? The goal: Get qualified leads via paid ads for ReactSquad.io (dev staffing firm) The idea: Run a giveaway where the winner gets $50.000 of credit for ReactSquad and for everyone who does not win a consolation prize $5000 of credit that they get deducted from their first months bill. There would be certain criteria to apply like geo, company size, etc. to weed out bad leads. Any guts reactions to that?