Don't give up if rejected as an affiliate
One of my sites is about caregiving for loved ones and stresses 'keeping them in their own home'.
I applied and was rejected TWICE by one of the companies that offer the medical alert devices ( I've fallen and can't get up type device). I was told TWICE that my site wasn't appropriate.
So, I emailed back and sent a link to my site and asked 'how is this not a perfect fit for your product?'
Within about 10 minutes I got a reply and was accepted! The girl that does the research said that sometimes the acceptance criteria matches the site but will still reject it....but, she took a look at my site herself and accepted me as an affiliate immediately.
So, if the product you want to sell is a good match for your site but you get rejected by the affiliate program don't give up! Follow up and show them you are a great fit for their product.