While considering Software-as-a-Service (SaaS) solution versus a traditional on premise software application, several factors should be kept in mind  at the time of calculating total cost of ownership and ROI. Both software providers and customers can be benefitted from the efficiency of the cloud's economic model. TO know about SaaS pricing, please go through the following link:

http://www.business2community.com/cloud-computing/saas-pricing-compare-cost-premise-vs-saas-0847567#!OHXf2