I traded two fungis (one of which was literally "the shirt off my back") and some plat to get my Torpor. Since one fungi is worth more than a JBB and Ikky BP combined, the answer to your question would be ... yes
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Honestly, once you get Torpor you'll find it hard to notice a Fungi's regen, let alone an Ikky BP's. And while you may miss your JBB a little, if you want you can solo farm the Seb crypt to earn one back (or, if you don't want to play at 3AM to get the crypt to yourself, you can farm any number of other camps to earn 10k plat, and then you can just buy a new one) ...
after you get Torpor.
Torpor will open up entire new worlds of plat and item farming to you, so the correct answer is that you should sell anyone and anything (RMT your children if you have to
[You must be logged in to view images. Log in or Register.]) to get Torpor, because once you have it you can much more easily earn everything you sold back.