Greed

The lower the price, the more greed plays a role.

When you lower the price of a product, you usually end with more unit sales. Keep lowering the price, and you'll continue to generate more unit sales than before if the price drop is big enough.

Go too low and you'll have to add a little justification for the lower price as it will start raising credibility issues with your prospects.

Greed is really not a very positive human trait. But it exists and it is a force to consider when communicating with your potential customers.