Because Adderall is 100% pure speed. A handful of Adderalls is more fun than a bag of cocaine (which is going to be more like 5% purity and adulterated with god knows what).
Basically all stimulants can be categorized by a level of euphoric rush, and a level of focus they provide. Caffeine sucks at both, methamphetamine rocks at both, cocaine's good for a body rush but isn't very good for focus, and amphetamine comes with relatively little euphoria for a methamphetamine-comparable level of focus.
Yeah, this is fear mongering; and I doubt any abuse you are seeing is actually happening on any sort of scale. To imply adderall is more fun than Cocaine/Cocaethylene is a completely strange assertion given cocaine's continued and greater penetration despite the fact it's a highly controlled schedule 2 drug. If you could have more fun with adderall, why would you spend more money on cocaine?
Not to take the wind out of your sails but adderall is also schedule II.
OP was correct, cocaine is much more highly controlled despite sharing the same legal category. It’s only used in certain surgical procedures. You can’t get a prescription for it.