Sure, but writing is my second (third? fourth?) job and sometimes I get paid for my published writing and sometimes I don't. The last article I wrote I was warned there was no payment, and they ended up sending me a huge box of free books for my school library. (Some articles are "peer reviewed" before publishing, but I only receive free copies of the issue the article appears in.) I'd like to think I bring the same skill levels to both my paid and unpaid stuff, especially since I don't always know in advance which ones are going to result in payment. When you don't always get paid, it's hard to think of it as pro writing.
So it's blurred, which is why I called the OP's comment a sweeping statement.
