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Jade Cells can crash now and then, but their price stays up because you can't buy them with cruor. Can make some decent cash doing (efficient) Campaign battles and buying Jade Cells with notes.
On this note, bear in mind that from my observations, Campaign returns cap out at 15 minutes of having the tags on, at 9000 EXP / 4500 AN (with the highest medal). If you end up in a particularly long battle and you know you haven't been slacking off for the 15 minutes, make sure you end up refreshing your tags at that point because it'll be pointless to keep the same set of tags any longer than that.