The more I think about it they more I think the 30 day cancellation is a mistake. TO think that if I post my card a little above the market and it doesn't work, I'm forced to pay to reprice it lower just means all cards will be driven lower.
Either make it so everyone card is cancelled at 30 days or none of them. This caveat of only cancelling the ones that didn't rent hurts the value of assets and ensures there will always be an abundance of bcx cards at .1 dec for the bots.