A couple thoughts after going thru the spin cycle of the blog exchange... I understand the comments about paying for others to blog.
Hiring a professional writer to blog for your site? The following is just a hypothetical example of what it 'might' cost to hire a professional writer to blog for an initial trial period.
For starters, you are looking to incorporate a new 'voice' within your blog. This takes an evalutation time in my opinion. The best/right approach for the blogger and the blog imo is to consider them joining in as a 'guest blogger' for an initial time period. For our example, lets say 3 months. How many posts? As stoney said, there is a balance and you won't want to flood your blog typically so readers can't keep up. For this example, lets say 3 times a week. So regarding quantity a scenario might be 3 times a week for 3 months. This would be a ballpark of 36 posts for an initial 'guest blogger' trial. Then there is the factor that different writers will write in different styles - long vs short posts. How many hours per each post? Its going to vary, but lets say 2-1/12 hours per post will be taken by a serious/professional writer. That adds up in our example to 90 hours.
How much does a professional writer charge? Well, again this is going to vary. But for our example lets say $60 per hour. Of course, this is going to depend on the writer and the profile of client (i.e. joe's shop VS dell). So fto hire a professional blogger for an initial trial based on the hypothetical example above someone might be looking at $5400.
That's the professional writer side. there are obviously professional writers that would be interested. And perhaps, for the right high profile site/client it may be of interest.
But not practical for many by any means, and the exchange is a free place where offers are being made based on many non monetary transactions and a lot less money than described above.
Regarding the whole 'lack of ownership' from the guest blogger, I didn't get the sense that was going to be an issue. I think because there is 'ownership' with what anyone writes. For example, how many publish articles thru other distribution points (i.e. this site for example) with great pride.
I did get interest/responses from what I did post there, so there are bloggers interested out there. And they were very experienced with the topic I posted. Really, it wasn't hard to find other 'experts' on a topic out there. Its just finding the right 'exchange' from your side, although I doubt many would find hiring the 'professional' writer the right fit - taking it from there with your own circumstances and making adjustments might spark something for some.
unless they are a PROFESSIONAL, who loves writing, the content will ultimately be substandard. secondly, this PROFESSIONAL, needs to know the market they're writing for and understand the business your company is in.
I thought the same going into the process, but after talking to others my mind changed to the possibility that this could be a serious way to really get a competitive advantage. I found experts in the area i was looking at that would have increased the 'profile' of the site beyond my own capabilities because of the expert type past experiences they brought to the table. Flip your thinking around, and I think it could actually be a potent competitive advantage within your business/niche.... if you do find the 'right' person who can bring past experiences/resume to your business profile.
I would love to write for someone's blog and have them write for mine. A true barter. No money exchanges hands and you get several writing styles to boot.
People love to write for free and show everyone what they know. You don't have to pay anyone to write on your blog, in my opinion.
And that sort of exchange is going on there. Without doubt, the exception is those that 'pay' someone to write/blog. But professional writers are hired every day for every sort of writing imagineable.... and many write for free everyday as well without payment. There is a difference when it comes to a professional/paid writer.