Why do you even bother with anything else when you could score more money than any other endeavors by hacking an exchange?
Are you too dumb to do what another human being has accomplished?
Considering the fact that unless you have the skills/resources to cover all your tracks; hacking an exchange (or anything else for that matter) is super risky. Especially with the ongoing increase in the use of technology in every day life, security is super tight and on the look-out for any potential "hackers" anyone with the skill-set to hack an exchange probably wouldn't need too to begin with.
When you say "with the on going increase in the use of technology in everyday life" it sounds like you put a lot of faith in systems you may not be knowledgeable about. You'd be surprised how flawed and vulnerable things are under a polished surface
Also people with hacking skills make nowhere close to tens of millions in their lifetimes. If someone had the skills and the intellect, they totally would