I would just like to be a little personal and say NOXT also cost me my long-term partner
Proof-of-Burn, right there!
Lesson there kids. Don't work so hard on building or trading crypto. that it costs you someone awesome. Take a break every hour, stretch and give your partner a cuddle!

Regarding the NOXT not sold burning. It can either be given to and held in escrow by a trusted BTC or NXT third party, or left in the public 'chest'. Whatever keeps everyone the most comfortable that I can't access it. Remember if things go to plan regarding scarcity and fees then we do need access in the longer-term.