@Peter Wolf - Some is semantics and some is true business change.
Cloud is deployment, SaaS is licensing. Put the two together and you have a total subscription model. Most people I speak to understand that they are paying a premium over the long term for a time value of money when comparing to perpetual licenses on owned servers. That is the semantics part. NetSuite is cloud only. ERP 100 Online is cloud, and if you buy licenses, or subscribe to them, you can still take them in-house. If you subscribe from Sage???
The business change is where a company starts to take advantage of the cloud to improve the efficiency of the operations. We are working with a company to provide custom connected services which we plan to plug into multiple ERP systems hosted in our cloud. Just like you can plug Avalara into the cloud or on-premise, the key is that we can provide these as pre-configured services in the cloud because we control the infrastructure This is much harder to do if we have to worry about different equipment, firewalls, etc.
In terms of overall costs, one of our customers has over 175 users and no IT staff. I would tend to think that we were less expensive overall for them. For others, we have pre-confgured databases in server templates that has cut our implementation time by 1/3 to 1/2 or more depending upon the application. How much of that savings we pass on to our customers is totally up to us today, but one day will be more market driven. NetSuite can discount their software as much as they want to a new subscriber because the incremental cost of the software and the infrastructure is very low. As long as Sage and SAP keep their perpetual prices at their current levels or keep their payback periods reasonably short, the market will continue to accept SaaS subscriptions at nice rates.
Eventually the technology and the richness of the applications will rival Sage's traditional feature function advantage. Bury your head, or confront the brutal facts.