Not all PMU foals are useless. When I was a teen, we had two that we suspected were PMU babies, but no proof. The one went on to a local rodeo circuit and was a pretty good mount. The other was a nice paint cross filly who would have done great in the hunter circuit if I had known about it at that point.
Not to get into a debate or anything, but just saying, most PMU farms are regulated more now then they were previously. It would be a big contract to lose if a drug company decided that they didnt like the facilities or conditions of the horses.
Katesrider (Your name is Charles, correct?)--This is a case for almost all drugs. Not everyone can take the "real" version and need to take the synthetic, or vice cersa. It is all about reactions to the drug.