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WARNING DO NOT SEND ANY BTS TO BEOS THAT YOU WANT BACK BEFORE RAINFALL STARTS ON APRIL 9TH. YOU'LL NEED SOME OF THAT RAINFALL TO POWER THE RETURN PATH.
Thanks for the fair warning, id rather keep my BTS
Why in the world i would want to exchange BTS for your worthless BEOS 
an old scammer trick in the book, Only a real fool would fall for this..
It is NOT an exchange of one coin for another. You merely stake BTS for the length of time you want them to be "rained upon" with the new BEOS token. When you are tired of receiving free token, unstake your BTS and you are free to use them any way you want again. You still retain all of the BEOS tokens that you accumulated while staking your BTS even after you unstake the bitshares.
Also, keep in mind that this is NOT an ICO. The opportunity was paid for and this middle blockchain between EOS and bitshares, BEOS, was released through private funding from VERY LONG TERM bitshares holders in order to bring a new level of opportunity to the bitshares platform (and therefore more value for bitshares tokens).
Since BEOS is not trying to raise funds through a token offering, if you don't want to participate, then don't. All the more raindrops for us who do participate to catch for ourselves. We thank you LoL