So, I'll go ahead and put my head in the sand here and just blithely push forward what a NBT/BitUSD partnership would look like.
An NBT/BitUSD peg:
There are arguments that can be made about who would benefit more from such a pegged pair. However, a simple compromise could easily be reached between the two parties such that all users of BitUSD can utilize the liquidity of NBT markets while still keeping their funds primarily in BitUSD. Such an operation would need to be paid for, and the compromise would be such that Nu pays for the NBT side and BitAssets pays for the BitUSD side. Of course there would be no price feed, 1 NBT = 1 BitUSD.
What is the cost in BitUSD?
I am going to guess that the cost is something like 0.2%/day. Looking at the BitUSD daily volume on coinmarketcap, it looks like $1,000 targets would suffice. The end cost would be $2/day, or 730 BitUSD/year.