I think many of us expect a watch made from a true factory, and have been used to expecting that quality. I.e. a Casio or Seiko will run you less than $100, but their distribution and supply chain methods almost guarantee that 99.9%+ of the product is perfect - and that is what many of us are used to.
The trouble with reps is that they are not built in a standard clean room production factory. Many of the factories for rep watches seem to be assembled by rooms that might resemble a sweatshop, or by family's (including kids), one by one. When you have things being assembled by hand as fast as possible, then being labeled and sealed in a bag and dropped in the mail, there is room for error. Given that there is no QC department or ISO 9000 quality department in the familys - we have to take what we get