Basically, savings. I don't have to want the item to plus it. If it is a good deal (as defined by 50% off original price or better for cheaper stuff, 35% off for big ticket items), then I will be more likely to plus it.
I think I range between all of these answers. I always recommend deals to friends when I hear they are looking for an item. Adding a "plus" here is like that. Might not be the cheapest of deals, but it is readily available and at a good price.