I remember the PS3 came out in I real estate developers in mumbai think 2005. Its been around 13 years since then. VHS tapes were obliterated very early on by DVD yet DVD has survived still. You see DVD's in every store rack. Why is Blu Ray still so obscure?
As a colleague said several years ago. "I've got a Blu Ray player but I still buy DVDs because they are cheaper. A comedy isn't any funnier just because it is on Blu Ray". Personally I bought a Blu Ray writer for my HTPC about four years ago and still haven't got around to fitting it. I hope it works as the guarantee expired years ago. The only Blu Ray I would really like to get is Live Aid. I expect someone will tell me the whole lot is on Youtube. P.s. I just spotted your location. I obviously don't know about prices elsewhere, but in the UK the going rate for used DVDs is about £1 (1/10th of the original price) especially when a film starts being shown on TV. I recently spotted three copies of "The Kings Speech" on the same shelf of a charity shop.
I guess it depends on what you want to watch. I have a collection of both formats, but if it's a film I generally go for a Bluray as I know the picture and sound will be better. Also I guess it depends on whether you want to buy is available on both formats or just one, some films/programmes haven't been converted to Bluray yet so DVD is the only option. Some older films in my humble opinion, don't really justify being released on Bluray unless they have been remastered, what's the point of having a clearer picture of an old grainy film?