I see reports of neutralizing antibodies in aesthetic application too.
An immune response rate that is sufficiently lower than the competition will pay dividends down the road if it is demonstrable. I don't see value right now. I also don't see value to the 'yuck factor' if they are already willing to be injected with a botulism toxin.
What would be interesting to know is if 002 is enough different from other strains to be able to treat some number of treatment failures from those strains.