My NuBot has an asymmetric spread at the moment.
The buyside offset is considerably higher than the sellside offset.
That is both useful to grab NBT during swings and to offer NBT at a good price, in case BTC drops.
If BTC were to drop significantly, increasing the sellside offset (by far not as high as the buyside offset) would be a "market aware" action manually conducted by me (to adjust the spread to the demand).
Running out of NBT is not that big problem though, because in difference to BTC we can grant them and still have plenty in reserve.
Buying BTC at a tight offset is a different matter, but I'm already fighting for an increased spread, which is mainly configured on buyside. I'm not in the condition to fight for a small sellside offset as well.