>>274684236
There's a huge difference between 1000+ usd and 230 usd. 
He also may not have the computer required to fully drive an index, while the requirements for the O+ are far lower. 
There is an array of available headsets out there to suit all needs and buyers, recommending that everyone only buy the most expensive one without taking their needs and use scenario into account simply isn't a good idea because unhappy customers leave poor reviews and spread poor word of mouth. 
If anon is happy with his O+ then maybe next year he'll by an Index too and tell all his friends how awesome VR is. If he stars out with an Index and doesn't like it all he's going to say is the VR is a ripoff.