As the owner of a Mac related blog (which includes software reviews and recommendations), I am putting in a vote for Serif setting up an affiliate program. I'll write up an article on Publisher etc., even without affiliate links. But in my prioritisation of articles, those that I can monetise typically get written first. I expect that's going to be the case for many others who each an income from affiliate programs.
The overheads on running affiliate programs are likely fairly minimal these days. It can be almost entirely (if not 100%) automated, after the initial investment of time setting it up. I run one myself, for my own products, and it's mostly automated.
In response to those who seem to have a disdain for or negative opinion about affiliate programs ... I see little value from questioning peoples' ethics and motivations for being affiliate marketers. It's simply another way of marketing, like advertising, writing articles on your company site, creating helpful (and product related) videos on a YouTube channel, etc.. Which are all methods businesses in the 21st century utilise to drive sales and market penetration.
As an example ... Amazon (which from year to year ranks between being the largest to second largest retailer on the planet), generates around 40% of their sales through affiliates funnelling people their way. https://www.prweb.com/releases/dekh/news/prweb10816600.htm