I personally think that this is a neat idea but VoiceBunny isn't the ideal tool. You pay about $70 for 400 words which is about the length of a short-mid sized blog post. If you just cover 5 posts per day, you will need to invest about $10k per month in VoiceBunny. At this point, looking for your own voice actors is probably cheaper.
Hi! VoiceBunny co-founder here. Our marketplace is new and the median prices are coming down on a weekly basis as more talents compete for work. Also, you are free to set the prices you want to pay. For ideas like hearablog.com, we are also implementing a royalty-based system, where talents get paid as the recording makes money for our client.