My kids are Lego obsessed and I admit I indulge them because my parents did it for me. They've inherited a bin of my childhood Lego and we've bought a bunch for xmas and birthdays.
I have 4 sets that are "daddies" Lego that they can't touch. R2D2 is the biggest but not crazy like some of the Star Wars sets. My stuff sits on a shelf in my office and I dust them off once a month. They're nerdy art more than anything.