Well if I was rich I buy every premium steel over the standard World Wide releases. It all comes down to money, budget and how much your other half moans when a package comes through the door, and they are saying, 'not another one!' or 'the same movie again!'
What I am now considering is for big Hollywood movies is wait for a premium release with all the goodies and premium slips and lenti and just open that one copy, and have the patience of holding off and buying the first local release and than double dipping to a premium. This hobby is getting too expensive to keep double and treble dipping. The issue with most is I don't think we have the patience to hold off until the premium arrives as this could taken months or even a year sometimes. I like to focus of having one definitive release for each big movie and getting rid of the, not 'terrible' initial local releases, but the standard cheap ones (although they are now becoming very expensive as well averaging £20 - £25).
Also keeping a premium steel 'sealed' with WEA and the goodies I can see as pointless sometimes. You never get to see it's beauty. I'm not getting into this sealed vs opened debate. But if I can hold off buying the first cheaper release I can make more justification opening the sealed WEA one or the premium WWA.