1) You lose credibility (whether its unfounded or not is irrelevant)
  2) People refuse to spend much time looking at your code

Over the years I've spent coding I've learned not to judge other coders based on their preferred style. Often enough I'll encounter really brilliant code whose style I find aesthetically unappealing (or "non-standard"), and I would have been worse off if I chose to ignore it. Some people just Think Different, and that's not always a bad thing.

Conversely, I've learned that prickly people who get red-faced upon encountering an unfamiliar style are often worth avoiding.