[bojan]

Being "Amateur" in certain field of activity means not taking money for carrying out that specified activity.
However, the amateur status is not amnesty for being a crackpot.
Science has its procedures and processes.. or it is not science (amateur or not).

Actually, I disagree with addition of this adjective ("Amateur science"), It does not make much sense since there is not much real "amateur" science to discuss anyway.. And most of us are just bystanders and "voyeurs"..