Some thoughts on the rest of those comments:
1) Self publishing is easy, that's why you should do it.
No, not really. Self publishing is hard. You have to first write the book, which is hard. Then you have to get it edited, by a competent person, which is not simple. Then you have to navigate the mess of scam-based "self publishing help" companies, realize they are scams, avoid them, and go direct yourself - this is not easy either. Then you need to learn digital formatting. Doable, especially for those of us with heavy HTML experience - hey, I used to hand code websites on Notepad. Formatting for Kindle? Could almost do it in my sleep. Not so easy for lots of other folks, though. (HTML? What's that?)
Then you need to get a good cover artist. No, not some guy with a hacked copy of photoshop saying he's an artist - I mean a designer, who understands book cover design. You can find these guys for $250-500, if you know where to look, but that takes time and effort and reasearch. Not easy. You can also do it yourself - which is even harder! Or hire a college kid to do a drawing for you, but then you still need to know good design principles. I studied design in college. I have done professional Photoshop work for game companies. Book cover design is still taking me a ton of effort to learn. Not Easy.
After all of that, you need to figure out how to market the thing. This is something all writers face, regardless how they're published - but not easy, not for most of us.
I miss anything? This is Not Easy. Most people will fail. Then again, most people who submit to publishers or agents don't see print, either. I'd guess the percent of solid self-pub success stories is a similar percent to that of people who submit to agents/publishers and win through to a contract for their book. I'd be guessing, but I think it's a reasonable guess.
2) Marketing is a big edge for corporate publishing.
Sorta true, if you can get it. Outside the marketing required to get into the diminishing number of chain bookstores, and if you're lucky a few copies of the book sent to reviewers, what does the average novelist get for marketing dollars from a publisher? I'm asking. The folks I've talked to told me"zero". My only book credit is non-fiction, and what we got was zero (although seeing it for sale in B&N was nice - and that in itself is a form of marketing, and still a powerful one).
If you want marketing, as a novelist, odds are pretty decent you will have to do it yourself. If you're a known name author, things can be very different; but for most writers that's just not the case.
So regardless whether you publish a book yourself, publish it through small press, or publish it with a big house, odds are very good that you will need to do most of the marketing on your own. Most writers hate that. Get used to it. It's part of the job, sorry.
3) A thought about the whole "sea of books" thing.
I hear that tossed out a lot. "But if you self publish, your book will be out there in a sea of other books; how will it get noticed?" How does any other book get noticed? The functional difference between being on a rack spine out in a bookstore next to 500 other titles and being one of a 30,000 new ebooks released in April is really not that extreme. Readers still are going to have a tough time finding your book over some other book.
And the higher that percent of digital sales grow, the more the balance becomes even between self published and corporate published books (assuming equal quality!). They're all plunked down in the same big "sea of books" for readers to sample and buy and review.
I don't have all the answers on this one. I know writing a good book helps (obviously). I know having a professionally produced cover and blurb helps (whether you make it or a corporation produces it). I know having a good price helps - again, regardless who publishes it, $4.99 sells better than $9.99. I know having a bunch of books out helps an author - each book acting as an ad for the others, so publishers will likely start thinking more in terms of wanting writers who can write a lot of books, not just one. But those are only some bits of the puzzle.
It's a big puzzle.
Nobody has all the answers.
Seriously though, if this is something you're interested in, go out and STUDY hard. Learn what the people who are doing this well are doing, and emulate them, or modify their tactics for your own use. There's a lot of random people out there spouting random advice. I'm one of them.
My strong advice is to go learn from the folks who are doing this right, and are achieving success as a result. Just like you would in any other trade.