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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.