bansama: He's professional enough for you to determine that the quality of his work was worth 10 dollars. If you don't believe that to be professional then perhaps you shouldn't pay for it.
Gerin: In sports, someone who gets paid a little, but not enough to do it full time, is called semi-pro. A paid and full-time practitioner is a professional.
I haven't had a chance to pull out the Oxford English Dictionary yet, and I promise I will... but yes... The key to the definition is that a livelihood is made from work.
But its even more complex than that, because the teenager who served you a milkshake at a burger joint is not a professional fast food clerk, even if that teen works 40 hours and pays all their living expenses from income from that job.
If anyone who receives any income at all in exchange for any kind of service or work at all is a professional, then every person with a dollar in their pocket is a professional and the word is rendered meaningless because it applies to everyone.
Professional, both as a noun and as an adjective, denotes certain connotations... one being that a professional makes a living doing something requiring a specialized skill or talent that isn't commonly available in the population at large.
The absolute truth is, most people write poorly. But anyone can put frozen pre-made processed french fries in a fryer. Thus there are professional writers and amateurs (or hobbyists or enthusiasts). There are professional chefs and there are guys who make french fries for $8 an hour. There is a difference.
The woman in this case is a hack writer, clearly one of the millions who actually possess no particular talent or competence for writing. Further, anyone with enough stubbornness to eventually string enough words together can "self publish" and offer e-books for $5, but there is no reason any of us should believe she makes her living doing that. No evidence exists at all. This woman may fancy herself an artist and writer, but she isn't either of these things.
I might be wrong. She might make lots of money exclusively from writing. I rather doubt I am wrong, and any benefit of the doubt I was willing to extend to her was lost when she lost her shit on a public forum and attacked a reviewer (an amateur, himself) for kindly reviewing her product.
...
And on a another note... there are lots of people who think they are writers, and they write everything from original short stories and novels to erotic fanfiction about Harry Potter.
Most of them aren't good.
But they are all writers because they write. They are all passionate and they put their best foot forward and try, and many will get better... and some will very much not. But none of these people deserve derision. They just need a creative outlet and writing offers them a sort of peace. And maybe, a few of them will get good enough to do it professionally, which is icing on the cake.
But this woman who published her poorly written ebook and made an ass of herself on a blog that actually elevates these non-famous mostly amateur writers and offers them a showcase and support, she made every one of those other writers look bad to anyone on the outside wondering if they should drop $4.99 on a self-published title. That's a shame for them, and something that instructs me to have no sympathy for her.
If you want to sit at the table with the adults, you have to act like an adult. She didn't, and she should have known better, and she gets the punishment that she asked for.