Sorry, but even the thought that any DemandMedia sites are considered high quality makes me laugh … eHow.com lost so much traffic its not even funny and now they are completely changing their SEO strategies to cope in a post-panda world
They have not regained the search visibility they used to enjoy and do NOT rank where they used to.
Panda Vol. II: Ehow.com got hit this time – SEO-Blog – SISTRIX Toolbox
“Ehow.com got hit this time. They were among the sites at which the farmer update was aiming but somehow survived the first round. Like in the UK, they lost massive visibility in the US since this week”
If this is you link building strategy … have fun with it as long as it last, but IMO you should really consider changing it now