Personally, I do alot of cloaking for clients so i guess I do BH SEO, BUT I do not use SPAN to get traffic, all my clients are in a situation where they have spent alot of money on the look and feel of the front end so cloaking PROPERLY done still delivers themed and relivant content.....the days of using 'barney" to drive traffic to an adult website for example are long over...do you know why ? because that traffic does not convert and after all thats what is all about CONVERSIONS. I look at it this way WH SEO is timed based and like fishing with a pole, BH SEO is more aggressive and its like "fishing with a net" using disposible domains.
See my profile and email me if your looking for more info
Cheers
WEB_I