Please don’t confuse liquidity providing with issuing and selling NBT!
At the moment it isn’t but some months ago it was 
How do you think the 562,036 NBT came into circulation if not by having been sold to people?
This was in a time when liquidity providing wasn’t decentralized but handled by @KTm and @jmiller.
A lot of the value that was retrieved for selling the NBT got lost during the February exchange hacks.
If Nu were to sell 100,000 NBT tomorrow, the revenue needs to be distributed to NSR holders, because they are the ones responsible for keeping the peg. Being responsible for the peg includes at worst case issuing NSR via grant to sell them, buy NBT and burn them.
As NSR holders are ultimately reliable for the NBT peg, they need to get the revenue from sold NBT.
Whether that is done by dividend distribution or by NSR buybacks is another topic.