One reason there are hordes of unskilled divers in Thailand
and throughout South East Asia is that many operations offer
bogus training, reports the South China Morning Post.
Hong Kong Underwater Association officials are warning of
  the perils of maverick operators who offer “short-course, cutprice”
  training. Fly-by-night dive operations have come under
  scrutiny as part of a wide-ranging investigation following a recent
  scuba-diving tragedy. 
Some operators, mostly working out of resorts in Malaysia
  and Thailand, are offering short courses and fake qualifications
  to students for as much as $135. Beginners are being given the
  bogus open-water licenses after as few as two dives with little or no
  instruction. Said an HKUA official, “these fly-by-nighters do not
  care if the trainee diver is up to standard or not. They are giving
  the licenses to divers who should not be in the water without
  proper supervision.”