Questions on: xrp-reserve

The Ripple account reserves are documented on the Ripple wiki. The trust line reserves are only for trust that you set. Others cannot cause your reserves to increase by adding a trust line to you
The issue is that for safety reasons Ripple currently has no way to remove the account root ledger node to completely remove a Ripple account. Since the reserves exist to help limit the size of the current ledger, any un-deletable ledger node require