Most supplements are bullshit. And even if they aren’t, no one has a patent on the basics that actually work, like whey or casein or creatine…and the fact that you are watching an ad means that they are spending on ads, meaning it’ll be more…
Geoffrey Verity Schofield
Why do you think creatine is so infrequently used? For example NCAA athletes routinely do not use it, it's considered almost a fringe practice in Division 1 basketball since the training staff can't recommend it (for whatever reason).
Furthermore I'm surprised at how we have so much of a "gym culture" yet the highest protein shake you can buy at my big box is 25g of protein (Muscle Milk). When 1.6g/kg for me is 120g, I'd need 4 of those if I'm otherwise not eating a high-protein diet. I'd say a lot of people cheat themselves out of results from strength training by underconsuming protein, especially dieting women.