Well, I store all my (mostly 1/48 aircraft) models in display cases standing around everywhere in my appartement. I have three in the living room, 4 in the bedroom and one here in my little 'office'. As there is no wife that might complain I am free to have as much as I want, limited only by space. I am quite concerned about my finished models because in the earlier years I had them displayed on open shelves and that allowed only a very limited lifespan - the main enemies being dust and nicotin stain.
I once tried to give a relatively large number of 1/35 armor models to the Panzermuseum at Munster. That correspondence lasted some years as they were really interested but finally never had the space to accomodate them. By now they are all sold via ebay and were quite a success. Not so with my aircraft models - I would never give them away except for some of the older ones if the opportunity arises (gift or sthg like that) One of them display cases is filled with over 20 F-4 Phantoms, it is never opened and the door gaps are sealed with tape. Long term storage. I cannot even think of giving them away, impossible. Ingo