I agree with you on this due to the quality control, however, there is not much big of a different having a tiny percent off here and there. I also agree that Pharm grade will always be more consistent, so that's why it is important to trust your source that has a good reputation.
Now in a cost vs benefit analysis, does it make sense paying $100 for 100% quality Cyp, versus $30 for 96% Cyp. Sure, the Rx Cyp is "cleaner" and more consistent, but it is also unjustly overpriced; is that worth 70 dollars, when a UGL can easily deliver the nearly the same quality, especially when many labs overdose to compensate, so it is essentially identical minus the guaranteed consistency per batch.
The only way to guarantee you are getting legit Pharm grade is from the Pharmacy, so even a source here that claims to get Pharmgrade, may be getting fakes because counterfeiters know there is a huge profit margin faking these products because of the demand for them. There's even fake GH pens for Christ's sake lol.
Ultimately, it's like buying a Versace suit worth thousands, or getting a decent suit from that looks just like that Versace suit, without the name. Both have the same function; one is overpriced because of the branding and production.