(I had a long sales letter and I sold an info product)
I remember a lot of other info products (e-books etc) long sales pages were slapped around that time.
Also, I remember very short landing pages (just for getting lists kind of types) had very low quality scores too. So a lot of info products sellers had hard time around that time.
Has the situation changed or still the same?
I'm asking this because sometimes Google changes its policy and I see some long info product sales letters or just for getting e-mail list landing pages more recently from Adword's links.