But if the ppl want them and there are only a few bikinis sets, yes its will worth more :) i don't know what you know about the cc economy but in my few years of playing cc always the items like Ghost Costume worth more because they didn't come back never again in packs ;) and the people want them so badly.
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Each if you are talking about the complet set.
More like 4-5k Just because an item has not come back in a pack for a long time does not mean it's worth more.