First, I don't think it's fair to judge these roommates on the actions of others. What does the kitchen equipment and cleanliness overall look like in your current apartment? How do people care for things? Make a judgement on THESE roomies based on their behavior.
Second, I respect you hiding a good set of knives, but how does one damage a (good) roasting pan/dish through normal use? Or a (good) blender, besides trying to blend actual rocks or something? I have a hard time believing in a good set of nonstick pans...though nonstick is very easy to damage through improper treatment. I might set out one of these sturdier things and see how it goes. Perhaps you'll gain confidence to share other things.
But on the other hand, use WILL make your stuff less pristine with time, regardless of the degree of care. Roasting pans get baked-on crud baked onto them that won't come off. Nonstick pans always eventually use the coating. Knives dull and need to be sharpened. Blenders eventually burn out. But if you try to protect your nice things from this, they will never see any use...does it matter if they wear out a year sooner or later, vs keeping them for years, unused? Ultimately your call of course.