Diminishing Returns for Links to an Unrelated Page

[wlingke1]

Suppose I have a new website about cars and I had created a page about something completely not-related - like cupcakes. However, I found that it was very easy to get high quality sites to link to the cupcakes page where as it was very difficult to get people to link to the homepage about cars.

If my goal is to increase the SEO for the homepage (which again is related to cars), is there a point where additional high quality links to my cupcakes page is not useful for it anymore? What if I created another page - about frosted cupcakes - which was also easy to get high quality links to?

[NickLeRoy]

If your an established business/brand the odd-ball non thematically relevant content is just going to be weird and could have negative effects on your brand reputation - regardless of the quality of content.

While what your saying does indeed work for increasing domain authority - it's not something I would suggest doing for a long lasting business.  I bet you could create equally if not better content within your niche that customers/users in your space would find 10x more valuable then your on-off content for a few unrelated links.