The value is tecknically the effect of what is called a stock market, and it does vary quite a bit over time as perceptions and economic factors change

Your things didn’t increase in perceived value as much as Amazon then

amazon grows its revenue → amazon stock value increases → amazon share holder richer

Many companies also pay dividends directly to the share holder but iirc Amazon has preferred to reinvest in growth

Amazon has been really successful in several domains and he’s owned a lot of it from the start

Although if you did earn $5k per day and managed to invest at a yearly return of 3% above inflation, you’d have about $41 trillion

At 1% above interest you’d just have $3.6 billion so invest wisely

(edit, corrected the numbers)