You may not ever earn or own that much money, but perhaps one of your descendants might be the next Gates/Buffet/Rausing/Musk (pick your favourite rich person).
If you are yet to breed, or having bred, yet to finish your job of raising that child, then you might want to include the potential financial loss that your descendants incur by not living up to their full potential, or taking an extra generation to climb above your current social level.
You mention a financial loss to "the economy", rather than explicitly to the household of the deceased. You may not earn $6.5M for yourself, but you might implement some feature that saves 1000 people who earn $65K each a year of effort.
Your employer may need to replace you, we often see posts about how important it is to hire the right people, because of how much the hiring process itself costs.
If a well-liked individual dies, then the productivity of some of those close to them drops for a period. Your next of kin may have to take time out of work to arrange the disposal of your remains, attend an inquest, deal with probate, authorise the withdrawal of life support from your brain-dead body (and deal with the psychological trauma that that might cause). Your friends and relatives may take a day off work to attend a funeral.
If blame is to be apportioned for someone's death, expensive legal professionals will be involved in working out how much blame should fall on whom. Insurers will argue about how quickly their liability should be discharged, and how much they should actually pay.