This is another case that demonstrates the need for someone to take on the role of balancing on a regular basis. @cryptog has expressed some interest in playing this role. However, it only works neatly when balancing like pairs. In that case, NuBits can be held when not actively balancing. When the need for balancing is identified, they are traded for BTC at one exchange, the BTC is transferred tot he other exchange where it is used to buy NuBits.
The complication here is that there is no other Blackcoin pair to use to balance with. A sensible alternative would be to take the Blackcoin, sell it for BTC, and use the BTC to buy NuBits, which can then be placed back on the Blackcoin/NuBits. Until order book mirroring is implemented, this activity is likely to result in small losses for the LPC.
