I think the risk is too high until profits start rolling in.
Amazon could, at any time, stop investing in growth and just start raking in profits. But they always break even because they spend every dollar they take in on new infrastructure. They are very transparent about the fact that they will continue to spend on growth for as long as they see the opportunity, and that's why investors like them.
As quickly as technology/internet sector companies can increase profit and revenue they can lose it just as fast.
Is Amazon really a tech company, though? Sure, they sell web services, and every sale they make is online, but they are a retail store. They sell physical products that people want and need, and they are even getting into groceries. They compete more with Walmart than they do with Google or Apple. And they are not turning profits because they are investing billions in distribution centers to make buying your groceries, electronics, and just about anything else almost as fast as driving to the store to buy it in person.
Amazon is where Walmart was 20 years ago, except Amazon is growing faster.