[Amazon Affiliate + Facebook] - How much earnings PPC in niche?

I got with first tries over 1000 clicks on an affiliate in a niche target group. But without bought products.

Is the combination Amazon Affiliate + Facebook good, or is it bad, because today everyone is in the mobile facebook app, with the built-in facebook browser and so the cookie (amazon affiliate cookie) doesnt be stored for the 24 hours?

We are just wondering, why there are no earnings yet. Is it technical (cookie on smartphone) or our yet bad strategy (niche, products, target audience, ...)?

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I think it might be a problem with your broad keywords. They must be attracting too much negative clicks and eating up your sales.

However, with the latest changes in Amazon backend keywords on 18th August, you can't put irrelevant keywords above the 250 bytes limit or else it won't index.