~A ripple on the water...
I do keep all my event items, and freebies too, but if I can't get all the items form the set on my own I just leave it be.
It does frustrate me when I can't get the complete sets, but it was never really a problem until last year. Switchem will forever be the bane of my existence. For-e-ver.
I have been tempted to use my mule to set up a wishlist of missing set items and sets from before I was a member so I could eventually buy them, but I know better.
...A tinkling on the wind~