Are you talking about epublishing, or self publishing (there's another forum for that).
I think you're asking about self publishing, in which case I'd suggest that it is *a* way for new writers to get started, not *the* way.
But I like the other question better.

So I'm going to run with it. There's a bunch of new small press companies getting started these days, specializing in just producing ebooks. Otherwise, they work just like a print publisher: they take submissions, accept the ones they like, maybe offer a small advance, edit the book, get a cover made, format it, upload it, and pay the author 25-50% or so of net on each sale.
Their costs are very, very low. This is the sort of business you can run out of your garage, practically. More realistically, you can run it in small town USA renting a fifth floor office someplace for $500 a month, running things with a staff of a few people and maybe a couple of freelancers for cover art.
Because the costs are very low, the companies can afford to put up a higher than usual number of books. In fact, I'd say that in theory the number of books put up is really only limited by the number of quality submissions sent in and the number of quality employees which can be hired - which given the job market today might be easier than ever.
So - in theory, mind you - I think these sorts of small presses might be a great way to break in. I mean, yes, you *can* do it all yourself. You can hire an editor, hire a cover artist, hire a formatter or do formatting, and market the book yourself. But there's a few grand in capital investment involved in that decision, a bunch of time spent, and no guarantee of a payback. Partnering with a small epress like this might be a valid/valuable way to launch a career.
On the flip side, watch out. There's a lot of these companies springing up, and some of them sound like they literally *are* run out of someone's garage - i.e. not very professionally. Most small businesses fail within 5 years (about 95%, if I recall right), so make sure you have ironclad version clauses if the company goes under, or maybe write the contract for a couple of years at a clip, and renew based on how they're doing? Most importantly, I would look carefully at the experiences other writers have had with them. Is the editing good quality? Are the covers professional? Is the marketing done strong, consistent, effective? I mean, you're giving them half the income of the book (or so) for their services. You want to make darned sure up front that those services are worth the cost.
So be careful, but yeah, I'd say these are worth looking at.