I have no need for the sheer number of dice I have, but I have desire.
I got my literal gem dice (as in machined form semiprecious stones) because they were gorgeous. The same applies to my dichroic prism dice. I have my metal sets because I just like the feel of them; the heft in the hand and the satisfying thunk as they hit the dice tray from out the dice tower. I have several sets of dice because the colours appealed to me. (I tend to give these out to new players as I introduce them.) I have speciality dice (FUDGE/Fate dice, various Chinese dice, etc.) for the times I need them. And in the end it winds up with me having way more dice than I strictly speaking need.