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I would say it's a good thing. I think it's something that Google could not punish.

Think about how many clothing brands will have a "buy from here" links. It would be ridiculous for them to punish that, it's a clear and distint sign that you sell their product, or you represent their brand.

You might not get too much link juice from them if they have hundreds of suppliers under one page.

We've had some shuffling for a keyword in the SERP results over last few days! Anyone else seeing their rankings bounce all over? It's only affecting one keyword that was previously a stable performer - this has occurred for the last few weeks (with no major changes to the page). Would be keen to hear your thoughts!