Hi, Jamie! Very good list. I needed something like this for 2018 so that I know what to target in the future blogs I create. As for now, I’m comfortable using SiteGround affiliate network and it’s pretty good actually. Their hosting service is pretty much the best considered its price. I’ve tried others but SiteGround stands out. I’ll also try new affiliate networks, something from the list you have just provided. I think Amazon is too saturated at the moment, and I need a better network. 2018 will be interesting indeed.
VigLink works a bit differently than other affiliate programs in that it is specifically designed for bloggers. Instead of affiliates picking and choosing which merchants to work with, VigLink uses dynamic links that automatically change to work with merchants that VigLink has determined are offering the highest conversation rates and/or commissions at any given moment.
Most businesses require startup fees as well as a cash flow to finance the products being sold. However, affiliate marketing can be done at a low cost, meaning you can get started quickly and without much hassle. There are no affiliate program fees to worry about and no need to create a product. Beginning this line of work is relatively straightforward.
BabyGearLab.com is basically the baby's gear version of OutdoorGearLab.com.  It has the same theme and site structure as OutDoorGearLab.com.  While it doesn't express that this site is owned by the same people, it's probably operated by the same group.  The structure is very similar and the focus is definitely Amazon Affiliate income for this site.  The cool thing about this site is that they actually have some really good reviews and content.  It's similar to TheWireCutter.com – but niched down, which is a popular route that most sites are going these days.

LinkConnector has struggled to stand out from the pack but nonetheless has managed to sign some exclusive deals with big name brands, including Writer’s Digest, the Disney Store, Ironman, Hats.com, and Everly. Their strictly controlled screening process for both merchants/advertisers and affiliates/publishers means that you can always rely on the quality of products on offer. 

I’d stick with Amazon if I were you. All of my Amazon sites only have Amazon affiliate links. If you use Google Adsense display ads on your site, you’re literally taking people away from your site for the sake of just a few cents with these type of ads. If you direct them just to Amazon, then you have a greater chance of earning more money from that click.

Clicking on the product name takes you directly to the merchant's page through the affiliate's link. (Incidentally, you may notice this affiliate has stopped most of his affiliate links being displayed in the status bar when you hover over them, by using a small piece of JavaScript. This makes the link more attractive to nervous clickers who might be scared away by the complicated looking URL and also helps to prevent link hijacking.)
Another one of the highest paying and most popular dating affiliate programs is eHarmony, which is based on the actual earnings that can be made from each referred sale. Up to $188 can be made from a single sale. In general, the members at eHarmony are typically looking to find serious long term relationships, so many of them are willing to pay extra to find similar people.
The most popular gadgets at the moment always seem to revolve around the mobile phone. Even though a gadget may be trending today, then gone the following month – another invention always pops up to take its place. Manufacturing companies are always looking for ways to improve current designs or come up with completely new ideas to make our lives that much better.
That’s the reason for their explosive growth in terms of content and links, they already started with several thousands articles which existed on the web for years and already had a great link profile. And they are backed by a huge media conglomerate, they are not by any means a small team since they have access to the about.com contributors that provide the articles, as there are over 50,000 articles on the website.
There's no max volume, but you do need to consider the competition. Generally keywords with very high search volumes are very general keywords and the giants of the internet (Wikipedia, WikiHow, domains with the primary keyword, etc) dominate, and so trying to rank for it would be very, very difficult if not nigh impossible. However, if you find no one else is properly optimizing for that keyword and it has monetization potential, go for it! Just make sure you understand how that keyword fits into your overall strategy. Don't optimize for it simply because of volume.
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