Far more than "several", Sharkky. Your analogy to a wart is not exactly a good one, either. Liken these cysts (the definition is different when one is speaking of a parasitic protozoan) to something like head lice, and a freshwater dip makes a lot more sense.
I have quite a bit to say in response to your "rant", but simply haven't got the time at the moment. I will say this, however: F/W dips are one of the most commonly used methods of control used, not only in commercial operations, but in the public aquarium with which I am most familiar.
Here are the mistakes that I can see were made:
1: Believing that raising the temp and lowering salinity "just a hair" would help alleviate the problem. In fact, raising the temperature simply speeds up the life cycle of the parasite. In using hyposalinity one must get to very low levels; from what I've gleaned you would have to take it down to about 1010 or lower to have an effect.
2: Believing that garlic (in extract or any other form) would act as a curative agent. Cupramine treatments are the best, most effective treatment for ich. (Sorry, Sharkky, but if we all use the word, and use it in agreement, then a rose is still a rose, yeah?)
3: Not immediately putting the fish into a q/t-hospital tank. That is the place to do treatments, including freshwater dips.
4: Waiting until the fish was so covered with cysts that it "had a white tint". This is clearly an advanced infection. Once it gets to that point the fish will likely be so far gone that with or without the dips and with copper he would have succumbed.
5: This 7 minute "standard"--where is this time derived from?
While I absolutely agree that prevention is the best cure, it doesn't preclude the fact that once infected a fish often needs treatment.
Sorry to cut this short, but I must.