Why Do People Collect Multiple Sets?

Not multiple different sets, like 1965 Topps, 1953 Bowman, 1941 Play Ball, and 1921 Exhibits (just pullin' a few out of thin air). Multiple same sets, like owning two cards of each of the 598 cards in the 1965 Topps set. I have never understood why anyone would do this. Personally, I develop an interesting love/hate relationship with the sets I collect, and I imagine if/when I ever finish one, I will only want to look at it...I won't want to start all over again.
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It turns out to be a very cheap way to build a high grade set, but obviously more work - as you are buying and selling.
Bosox1976
Phil
My Hoard of 93 Finest Refractors and 94 Pinnacle Artist Proofs and Museums
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.
Some who collect vintage may just want a complete set, so they settle with one in lower condition -- while working to build a higher condition set.
I don't understand the modern stuff though -- I personally think the majority of "collectors" who have multiples (3+ of sets and players) suffer from a mental illness spending most of their time justifying their addiction.
And then again, it depends. Some do it for financial reasons (to hold onto, sell, make profit -- hopefully) And others simply for attention.
Buying lots, like Bosox said, and upgrades can bring a guy to nearly half another set in no time.
My favorite set is the 1963 Bazooka All-Time-Greats. 41 card set.
I curently have the #4 on the registory, I checked my second set would be #7. But I deleted it for now.
It's the best set to complete if you want a set of all Hall of Famers, and nice looking cards.
Dave