Lets say I want to buy bitcoins today and store them for 20 years to use a my retirement fund. Live comfortably, but don't need to buy a yacht or anything. How many do you think I would need to buy?
Well depends on what you find as a "live confortably" and how long you want to live
You want to spend 1000 usd/month when you will be retired ? 5000usd/month ?
If you want to have money you cant think ... how many would i need .. you have to think how many times I can multiply wealth I have now
I agree, though I strongly believe that the bitcoin would exceptionally increase in value