Your question intrigued me. So I figured it out. This list makes the following assumptions: A day one player of the first game who has bought every expansion at launch, in the bundle so as to get it slightly cheaper than buying them separately.
It also does not take into account any spending on EverVerse cosmetics. This is just for the game and all its content packs:
- Destiny 1: $60
- Destiny Expansion Pass: $35
- The Taken King: $40
- House of Wolves: $30
- Destiny 2: $60
- Year 1 Expansion Pass: $35
- Year 2 Forsaken w/ Annual Pass Bundle: $70
- Year 3 Shadowkeep Digital Deluxe (includes annual pass): $60
- Year 4 Beyond Light Deluxe Edition (includes annual pass): $60
- Year 5 30th Anniversary & Witch Queen Deluxe Edition (includes 30th Anniversary Pack and annual pass): $100
- Year 6 Lightfall + Annual Pass Bundle: $100
- Total: $650.00
Destiny as a franchise is 8.5 years old, so that cost averages out to $76.47 per year, so far.