Ask HN: Is paying for a BIMI certificate useful?

came across BIMI as part of tightening our email security, and would love to know if it's worth doing it or not? For context, it's small SaaS app, sending transactional emails mostly, with some onboarding/auth. Paying 1500/year is OK if it increases deliverability significantly, but would rather not waste cash if it's just a UI tickbox. We already enforce DMARC.