Should I add author markup to sales pages?
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Adding author markup to the homepage or to SEO optimised sales landing pages is possible. However it doesn't really seem to be using the feature in the spirit of it's purpose.
It makes sense for blog posts.
It's possible for other pages and will likely improve CTRs from SERPs. But is it against the spirit of it's purpose?
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It might increase CTR, but I would expect it to also increase bounce rate.
As people are becoming familiar with the snippet format, they're associating it with articles and blog posts. If they think they're clicking on a link that leads to an article, and they arrive at a product page, do you really think they'll stick around and give you their money?
It's widely believed that pogosticking (users bouncing immediately back to the SERP and clicking another result) can harm your rankings. So be careful with anything that might lead to a mismatch between searcher intent and page content.
I wouldn't be surprised if Google eventually starts ignoring rel=author markup on e-commerce product pages. (Which they will be able to identify very easily as more and more sites adopt schema etc.)