I have a question that somehow depends on people's taste I suppose. I like the amsart package for my documents, however I always found the margins too large, so I got used to making them smaller (3cm) using the geometry package.
When the article goes to a journal it doesn't matter in the end because they will format it accordingly, so my question is rather aimed at the preprint version, which is usually the one in the arxiv/home webpage.
What do people prefer generally? Big margins? Small margins?
Why does amsart sets the margin so large? I know it's for their journal specifications, so the question may be rephrased: what's the reason that these journals like the margins so big? I'm looking for an answer in the lines of "because it's better for reading according to such and such..".