What are two web-based promotional techniques and what are the advantages and disadvantages of using each?

1. Web exclusive insentives, i.e. 20% for buying online. If they call or come by your physical location they can't get that same savings. Advantage: More site traffic, and the possibility of less overhead since you can man a phone or location less. Disadvantage: None that I can see 2. Web Giveaways. Simply put you have a trip, car, or even smaller, giftcards that you giveaway each month, quarter, etc. and the potential customer must sign up through email for the drawing. Advantage: Increased site traffic, Collecting a database of potential web customers. Disadvantage: "prize hogs" signing up for just the prize and having no interest in your product or service.