I increasingly more often meet cases of non-payment with the wording that the traffic is of poor quality, the buyout is shitty, so we will not pay. This tendency is a little tense...

For 2 years I had no such experience, until I've decided to work with m4l.
I was told "we'll pay you tomorrow" for a long time and then I was told that the buyout sucks and we will pay only for what we redeemed.
I am sure about the traffic, and m4l was satisfied with it.

The way I see this situation:
Over the past year and a half the approve dropped significantly and it’s been increasingly rare to meet with approve of 60 +. And I think this is a consequence not only of the appearance of ruble and free stuff, but sly affiliate.
CC do prohibitive checks and some people who are just ashamed to refuse the ordered goods or this check makes check makes them think better, just didn't take the product, and this approach is paid by webmasters.

I would like to have fewer affiliate programs who want to compensate their greed and at the expense of webmasters and more affiliate programs who know what the word reputation means.