I'd say the percentage doesn't sound so great. The other issue I see with recruitment though is that there are a few people that come on this board just because they don't like UC and would like to cause problems or go make fun of it on rant boards. I've seen a rant board before and it was sad.
There are definitely quite a few people who are vehemently against UC. They know they can't say much on this forum because it's for the purpose of supporting those who choose to give birth unassisted, but sometimes they try. I'm sure even more lurk, foaming at the mouth, wishing they could "stop all this nonsense once and for all". What better opportunity than an anonymous survey?? They can pretend that they had a UC, say that they're baby died and claim that this was because it was unassisted. I don't buy it. It's simply too easy for someone to lie, especially given how many people are passionately against it. I don't think there is a way to get statistics that we know, beyond a doubt, are 100% true and accurate. Here's another UC survey that was done, again, I don't know how accurate it is, but it shows that it's not necessarily all doom and gloom: http://www.unhinderedliving.com/stats.html