Is it necessary to have interest in the product being sold?
I would think that the whole "interest" thing would apply just to large content sites or for creating your own product like a How To Book or other info. A lot of affiliates do not build large content sites on the niches they promote, so it would not matter if they were interested in it or not. Even if you do find something you are interested in, all the site building and promoting is still tedious anyways and will take most of the time. Nothing wrong with going with a topic that interests you as long as you have researched the market and determined that it is something people are and will buy a lot of. So you're not wasting your time. A lot of affiliate only marketer's interest lays in marketing and the internet, and psychology of human persuasion. So it wouldn't matter what they marketed, it's all about the game of marketing itself that's interesting and winning that game brings large profits.
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Stock brokers and players have an interest in the playing of that speculation game. Does it matter if they have an interest in subject matter and product line of each company they buy or sell stock in?
For creating your own products it would be more important. Especially if you are giving advice and instruction and trying to brand yourself as an expert in that field. Sort of like Matt Furey. I heard his sites sell $10,000 in products per day. No affiliates.
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But if you are just getting people to buy another person's or companies products and creations you don't need to know too much about it or even have that much of an interest in it yourself. As long as others do.
Personally I don't care if I have any interest in any affiliate product I promote as long as I have nothing against it and it does no harm. I won't promote anything that I know is very harmful, exploitive, abusive, destructive or deceptive. That's more important then if it is "interesting".