<p>Yes, cost for taking a ghost offer seems necessary to prevent abuse.</p>
<p>My guess is ghosts will increase your arbitrators' work, because makers lose their wallets, or something, and can't wake up the ghost.</p>
<p>That seems to lead to making ghosts expire after a few days, if not taken, or if they cause arbitrator intervention.</p>
<p>That also seems to lead to making offers expirable, if no one takes them, which would also increase arbitrator involvement, and maybe involve some kind of CHECKLOCKTIMEVERIFY mechanism?</p>
<p>Guess the ghosts will have to be kept online by online peers passing them to each other?</p>

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