My kitchen cupboard has been taken over by large plastic souvenir cups. I did everything I could to try to prevent it. Every time we've moved, I've consolidated. "Do we really need three of the same one, honey?" I have relegated some to Pen Holder status, which somehow seems more acceptable to me than serving my family 40 oz. beverages. Some of the giant plastic cups may have gotten lost, but I wouldn't know about that.
In the picture below, you will notice that my glass glasses take up very little space, as they have been overtaken by my plasticware. When I picked things out for my wedding gift registry, I never imagined having more plasticware than glassware. But the unshatterability of the plastic, not to mention the relative unconcern for the care of it, makes it an ideal choice for my family right now. And, for my guests since the spots from the hard water aren't as noticable.
I have to admit, though, that I have purchased one or two of the souvenir cups myself. It is fun to have a little memento of a family outing, or of teams we've cheered on in the various places we've lived.