I believe it was because they were very effective,....Ive heard of numerous people searching for that specific brand(parazapper) to treat their disease/health problem because somebody they know has/had one that cured them...it may be that they dont want a zapper on the market that has enough power for full body penetration as you would achieve using the handles and foot plates...the fda u$ually doesnt like anything that cure$ people of what they would call ''incurable''.
make$ them look like the liar$ they are and threaten$ their wallet$