No matter how far the world goes, the final goal of any business is to generate profit. For that, it needs to convert. To achieve this goal, the consumer - or user in the case of software - needs to feel comfortable with the interaction they have with their product, or service provider. In the digital world, this is known as User Experience (UX). The better that relationship is, the better the sales potential.
http://www.dotcominfoway.com/blog/12-ux-tips-to-boost-your-website-engagement-and-user-experience-for-a-better-conversion/