Theoretically, a lot (most?) of healthcare costs are downstream of being overweight. Going to the doctor for diabetes, hypertension, knee problems, and the long term effects of those might be less costly than a constant subscription to purchase GLP-1s.
Bonus is you no longer crave expensive sugary or alcoholic drinks and food.
$1000/month seems like a lot. Although if you end up eating significantly less, there's some savings there.