Suppose I could chime in on this one, even if I'm new to this site (and relatively new to colecting star wars Lego).
I'm sort of a loose collector, meaning that I open and build the stuff. I then set the sets up for display or store them safely. I would never take a set apart after building it. I suppose that is very collector-ish, since I'm really not after the play value. For me the collectablity factor is closely related to keeping sets 100% intact and complete.
The colletor in me would like to have stuff mint in seald box too. Actually I feel some of the authenticity of these sets in terms of them being a collectability is lost the moment they are opened. So to some extent I feel I am destroying something by opeinig the sets (as perverted as that might sound - after all it is a toy).
But colleting MISB too would mean buying two of everything, and that is simply something I can't afford given the Danish prices. Besides I collect ot ther toy lines so my Lego budget is limited. And I'm not ready to give up hasbro colleting in order to buy doubles of star wars Lego.