I mean, you’ll find people using PEDs in any sport, despite the risk of bans and everything. Steroid use is also rampant among bodybuilders.
There is an “obvious market”, but why do such sport leagues or federations that openly allow those drugs exist?
I can imagine that such a thing existing would create an immediate and widespread health problem with lots of people, athletes or not, using those performance enhancers and accidentally fucking themselves. But what else could be a problem?
Another take is that sports are all about rules. The goal of hockey isn’t just to get the puck in the net. There are other rules that turn this minimal task into a game. Otherwise players would just come on the ice and fire the puck via a rail-gun. To make an entertaining sport you need a goal and a set of rules that make and interesting challenge.
To some degree if you allow performance enchaining drugs at least some of the focus moves away from physical skill, reactions and strategy into pharmaceuticals. Don’t get me wrong, finding the best drug cocktail to play hockey is a very interesting challenge, but it seems interesting to a very different audience than that which appreciates the other aspects of the challenge.