Don’t try to understand Blackrock’s strategy or play here. They could be owning AVXL for 100s of different reason than us — and, AVXL is certainly not worthless (by any measure it is worth $9-11 at this point). Neither is its future known predictable.
We also can’t blindly follow what Blackrock buys/owns — since we don’t know its strategy or plan.
We can only look at ours. What exactly are we owning it for? For a bust or lottery in 10 years? Fine then — then keep it fir 10 years untouched.