As search engines have become more prominent, some affiliate marketers have shifted from sending e-mail spam to creating automatically generated web pages that often contain product data feeds provided by merchants. The goal of such web pages is to manipulate the relevancy or prominence of resources indexed by a search engine, also known as spamdexing. Each page can be targeted to a different niche market through the use of specific keywords, with the result being a skewed form of search engine optimization.
(That's why some of those products have such high gravities, of course: it's not that they're selling well - it's the fact that so many people just buy one copy, each through their own hoplink, so the gravity rises and rises and rises, though the sales numbers may actually be comparatively small, compared with many of the products I'm promoting with gravities around 5 or so, some of which are selling by the thousand. But I digress ...).
Time Investment: Affiliate marketing is not a plug-and-play solution that doesn't require a time investment. You need to invest time into your program to get it set up, recruit affiliates and then provide ongoing affiliate management. You'll find that most of your time will be spent on keeping affiliates happy, resolving issues and managing expectations.
If you're looking to address some immediate financial needs, then the app economy is likely right for you. Thanks to the global sharing phenomenon, launched in part by our smartphones and ever-burgeoning global connectivity, you could easily opt for some quick active income by using well-known apps. From ride sharing to deliveries and even quick tasks, there's an app for that today, as the saying goes.
One of the cool things about Google AdSense is that it's so easy to get set up. If you have a blog or website, you can sign up for a free Google AdSense Account. From there, Google will give you a unique code that you will paste onto your website. Google takes it from there, tracking your page views, traffic, and earnings on your behalf. There is no upkeep or maintenance to get this thing going, which makes it a no-brainer if you have a website already.