Or meant to provide answers for questions before they start. Looking at my character, one might wonder about how he got all this- the backstory stalls peoples' accusations of pulling something out of my arse...
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I argue that it would create a more authentic experience. Pirates are an untrustworthy lot, even amongst one another. It would lead to your character having to gain the trust and respect of his fellow crew members. Sure you're character would be heavily scrutinized. But they are making a very tall claim and should be expected to back up their story for themselves, not through OOC intervention. If they have to argue their authenticity to others, so be it. Part of the experience is to get sized up quite a lot.