That sounds about right. Unless your video was super-duper amazing, then your numbers should be much higher. But given the quality of most of BHW's videos, I'm not exactly shocked by that.
YouTube traffic may be targeted but my experience is that turning YouTube viewers into buyers with a direct video-to-sales-page doesn't work very well. You need to have an intermediate page to further warm the offer. Collect the leads, and re-market to them. Sending your YouTube traffic direct to an offer is crazy unless your video is specifically about it, like you're specifically reviewing a product. If its generating general weightloss traffic, you should be trying to collect those leads instead.