You can just buy adrenochrome, e.g. here from Sigma-Aldrich. It's somewhat expensive for a relatively simple chemical, but not as expensive as it would have to be if the only way to acquire it would be by extracting it from the blood of frightened humans.
It can be synthesized by oxidizing epinephrine (also known as adrenaline), which is available pretty cheaply in bulk. Wikipedia mentions a synthesis using silver oxide, and I found another paper describing a different route. This is not a very complicated molecule, so there is no reason to believe that synthesizing it would not be feasible.
I couldn't find much useful research on adrenochrome, the only studies seem to be from ~1950/1960, and I'm not sure I'd trust them very far. In a review from 2002 about the adrenochrome hypothesis of schizophrenia they describe the results of one of the older studies:
Their reported results were that, all eight subjects given 30mg of adrenochrome developed a psychotic reaction, which they characterized as a toxic psychosis of the Bonhoeffer type in five and as schizophreniform in three.
That doesn't say anything about it being addictive, but something that can induce psychotic reactions that reliably at higher doses doesn't seem like something you want to take recreationally. Though as people obviously still use drugs recreationally that can have similar dangerous side effects, I can't exclude this even though there are also no "positive" effects described that might lead people to take a substance like this.
It also does not seem clear whether blood actually contains adrenochrome:
Hoffer (1957) published a paper in the American Journal of Psychiatry claiming to have detected adrenochrome in normal human blood. Six months later Szara et al. (1958) reported in the same journal that they could not detect adrenochrome in normal human blood.
So, if you really wanted to consume a substance that triggers psychotic episodes, it would still be far less risky to just buy it from Sigma than to kidnap people and drink their blood (if there is even adrenochrome in their blood).