Niche to target

Another thought, if it helps ...

Generally, I don't think "problem-solving niches" are nearly as good as "enthusiasts' niches". I know all those awful "affiliate marketing guidebooks" tell you to "find something that solves people's problems and sell it to them", but it seems to me that they haven't quite thought it through.

When you're an affiliate marketer, once you've built your subscriber-list, established your credibility, formed your subscriber-relationships, and all the other basic, essential things you need to do to make affiliate marketing worthwhile, you're then going to promote your first product to each subscriber, according to the number of days for which s/he's been a subscriber and autoresponder emails s/he's already received from you (assuming that you have the sense to wait until then, and not lose most of the potential customers by promoting too early, as many people do!). A proportion of them will buy it.

At this stage, "in problem-solving niches", looking at it in very simple terms only, one of two things happens.

Either they like it, they think it's great and it solves their problem (the result is that you can't sell them anything else because they don't need to buy anything else, so you've just lost most of your potential future income) ...

Or they don't like it, they don't think it's great and it doesn't really solve their problem, (the result is that you can't sell them anything else because you recommended a bad product, from their perspective, and blew your credibility, and they don't trust you any more).

Not a great outcome for you, either way.

In "enthusiasts' niches", people gradually buy more and more and more, to feed their enthusiasm, so you don't have that problem to anything like the same extent. (Having bought expensive things from this spring/summer Louboutin collection won't stop me from enthusiastically buying more expensive things from their 2014/5 winter collection.)

Be aware that for successful affiliate marketers, most of the long-term money comes from making repeated sales to the same captive audience (your subscribers - that's why listbuilding is so important!). That's why "enthusiasts' niches" are better than "problem-solving niches", and we're perhaps better off looking at those, rather than at how to solve others' problems.

TL;DR version - once you solve someone's problem, they may not still be a customer at all; and once you fail to solve it, they may not be your customer.

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Granted, there are areas of overlap, too. I did stress "looking at it in very simple terms only".