Model manufacturers rarely condescend to tell mere mortals like us why they do things. I have the impression that Revell's normal practice is to squirt out a number of kits, based on projected sales; when they're all gone, management decides whether another batch is justified. If so, the molding machines go into action again and the kit gets re-released, often in a different box. Quite a few of the manufacturers seem to work that way.
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Bottom line: if a kit becomes available, decide whether you want it, and if so grab it - if you can afford it. There's no way to tell whether you'll be able to find it a few months later or not.