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In general, the MOBI format (and reader) does not take a global view of the ebook and so it should not matter much how big it is. It is possible that the limit is just in the previewer, and in the Kindle Store.
Note that in some cases Amazon charges the author or publisher $0.10 per MB for whispernet download rights, so that would be $30 per sale in your case. This should not matter if all you want to do is side-load the MOBI onto a Kindle.
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