Keep in mind, that BTER was hacked and the hacker had access to all of BTER's cryptos.  He told Nxt because he felt it was the most valuable, and returned 85% of it to BTER.  This was a compromise where the thief was trying to get away with as much as he could without destroying BTER, or especially Nxt.  So he got away with 51 million.. returned all but 8 million.

This was BTER's fault, not Nxt's.. and a far larger percentage of BTC have been stolen than Nxt.

Also the promise of anal sex if he returned the funds may have played a part.. lol