This is a poor way of trying to sell SaaS products and other software.

Unfortunately, it's also the ONLY way most people in the field know how to do it.

I've written several times about the reasons demos fail to sell. Here are the links:

http://www.salestactics.org/why-demos-fail-to-sell/

http://www.salestactics.org/how-saas-vendors-get-it-wrong/

http://www.salestactics.org/saas-sales-problems/

This is a great opportunity for you to set up a sales process that's effective now, rather than wasting resources on a broken model.