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Guru's database is so large, most advertisers screen out writers who do not have paid memberships. This, in theory, eliminates fly-by-night writers who are not willing to pay or to maintain a monthly subscription to the service.
On Elance and Guru, most ebooks are outsourced for a flat fee. When I say flat fee, I'm talking about the money you offer to pay the ghostwriter (as opposed to the various percentages and fees taken by the database site). If you choose to, you may, in addition to the flat fee, offer a ghostwriter a per-sale percentage. This is a good-hearted thing to do, since the writer created the work. Even ghostwriters have to live. You are never under any obligation, and most ebook owners don't offer percentages to their ghostwriters.
You will be required to use the payment processors on the sites, so that they can take the appropriate percentages, and also so that the writer is somewhat guaranteed to receive proper payment. For example, on Guru, some writers may opt only to receive payments through an escrow plan. By doing so, they require that their clients have the payment available in full in an escrow account. Although actually payment is not transferred until agreed terms are met, the money is sitting in the account, to be paid upon completion. Having the money sitting in escrow builds a writer's trust in your ability to pay.
You also may if you wish offer credit to your ghostwriter in your ebook. It's occasionally a common practice with paper books, and you may do the same in your ebook.
I recommend it, because it's a nice thing to do and will please a good writer who you want to remain on good terms with. Here's how you do it without flat-out telling readers your book was ghostwritten. 1) Thank them by name in an acknowledgements paragraph. Don't mention what exactly you're thanking them for. Your acknowledgements paragraph can be in a foreward, and introduction, or near the end of the ebook. 2) Include the ghostwriter name in the byline in an inconspicuous location in the beginning of your ebook. Don't do this on the cover or in your web sales ad, and don't make it prominent. In small print underneath "by" Your Name, include the phrase "with Gary Ghostwriter." 3) Instead of using "with," use "as told by."
I wouldn't go as far as to say that giving partial credit is a universal practice, especially with ebooks, but it is done, so you might want to think about it. I do it sometimes, but not all the time with ebook ghostwriters. I decide based on the quality of their work, the possibility of follow-on ebooks, and whether or not the readership would be compromised in any way.
Here's why I'm telling you the partial credit stuff: even though it's something you can offer that is often considered as good as compensation, I do not recommend that you offer it outright on the database sites. Regardless of what other advertisers are offering, only offer partial credit if the final product warrants it. I implement partial credit on a case by case basis, and never offer it to an unknown writer up front.
Alternative to writer banks

Frankly, placing your project ad into a large database like one on Elance or Guru and getting competing bids is the most efficient way to find a ghostwriter. However, I would be remiss if I didn't at least let you know that there are some ghostwriters that you can hire directly. I

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