Jumping into an ongoing at #30 a bad idea?

Just out of curiosity is it a bad idea to jump onto a book when it's issue's are in the 30's? I thought about jumping into some on-going books that are in that are.

If you start at the beginning of a new story arc it wouldn't be too bad. Or if a book ever changed creative teams you should start there.

Depends on the book really.

What did you have in mind?

completely a book by book basis.

It really depends on the book. Some series take FOREVER for anything interesting to happen, for example, so in those cases jumping in around #30 is a good idea.

Depends on the writer. Some like a build up, others like self-contained stories, some like it to be heavily connected etc.

Depends on the book.

No, even if you are in the middle of a run, back issues are readily available. I didn't need go over the past eight hundred issues of Tec comics to love Snyder's eleven issue run.