TJD, with access to raw material and the right equipment, anything is possible.
Wet-processed fina is one of the easier conversions, however, the drawback lies in not accurately knowning the exact mg/ml.
Brewing Test Prop. is another common process although it requires a bit more work.
As for your last question, my guess is the number of people not willing to research the process, spend a fortune, and have the possiblilty of getting ripped off exceeds those that do the opposite.