I have a casascius set that I will consider complete after getting the coin in the topic. Some of them are graded and some arent. Personally I hate the graded slab so I want to take the slabbed ones out in order to display them much more nicely. Would I destroy a lot of value by doing this, rather than keeping them in relatively low number anacs slabs?
Keep them in the slab, you get a higher premium for high graded coins. At the same time they will protect your coins too. I personally have never sent any to get graded and mine are in plastic capsules only.