Generally speaking, by offering "discounts", customers feel the need to purchase your service immediately before the "deal" goes away. I have been using this method on eBay and it has proven to be very effective.
How Do I Offer A Discount To My Customers?
In this example, I took the original pricing chart, and did a little editing with Photoshop. By making the price seem more expensive than it actually is, customer think they are getting a "huge discount". However, they are actually paying the regular price.
I make it seem as if the regular price is $225, although it has always been $150.
This particular listing ended the first day, along with many others.