Makes sense. Software as a Service and all....
The best bargain Microsoft has for those of us who don't need the extra services like Skype for Business and OneDrive for Business is Office 365 Home, since the apps within Office are the same whether the suite is for Home or Business. You get seven apps for Home, while you only get six for Business. Go figure.
The math for my two computers and 'droid 11.6" tablet:
O365 Home = $99 per year for five computers and five tablets
O365 Home Standalone = $149 for one computer
O365 Home & Business = $99 per year for five computers
O365 Home & Business = $229 for one computer
O365 Business Premium = $399 for one computer
Home Standalone = $298; 'droid not eligible (subscription needed).
Home & Business Standalone = $458; 'droid not eligible (subscription needed).
Business Premium Standalone = $798; 'droid not eligible (subscription needed).
It should be noted that standalone programs pretty much remain static, with no updates/upgrades to speak of.
So, based on the above figures, I could have:
A 3 year subscription to Home (and add my 'droid and three more computers to the mix if need be).
A 4.5 year subscription to Home and Business (and add my 'droid and three more computers to the mix if need be).
A 5.3 year subscription to Business Premium (and add my 'droid and three more computers to the mix if need be).
On average, new versions of standalone programs come out every two or three years. Not everyone will upgrade that often, but not that many will hold onto a program more than four years either. Business users will upgrade on average, every two to three years. Home users less often.
Regardless, if one has more than two or three computers, all of which will use O365, it's easy to justify subscription vs standalone. Besides, O365 would always be up to date.