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I doesn't cost you anything except 3 minutes to copy couple of files, open browser and touch 2 buttons.
It's better to have it (jailbreak) and don't use it than not to have it. There is always a chance you could change your mind about wanting some of the hacks and extra functionality, but it would be to late then if you Kindle is already running newer firmware that can't be jailbreak-ed.
Jailbreak itself has zero influence on performance of the device and it's firmware.
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