Tim Cook I don't think really thought about how to sell the vision pro.. It should be $0.00 if you buy X or Y, or take out a binding contract for z number of years, this is called amortization, so that say over 3 years, 36 months, the cost of the vision pro is written off, but you as Apple gain value.
For example say you take out a 36 month contract and this has to include a $120 a month product from Apple, whatever that is, icloud+tv+whatever, Apple gain income and can pay for the vision pro, it is no different to many ISP's that provide "free" routers if you take out a 2 yr contract.. Every 2 yrs, the router is replaced if you take out a 2 yr contract, if you cancel, you pay a lot for the router than if you bought it from say Walmart...
This is where I think Apple made a mistake, the vision pro should have been free on a 3 year $100 a month, with access to certain services included.. After 3 yrs the vision pro is yours..