For example, what are the quality and quantity of the links that have been created over time? Are they natural and organic links stemming from relevant and high quality content, or are they spammy links, unnatural links or coming from bad link neighborhoods? Are all the links coming from the same few websites over time or is there a healthy amount of global IP diversification in the links?
One of the affiliate marketing benefits, is that you can create a second income, but it is also possible to generate a full time income. To earn a full time income, you have to spend more time on it, and commit to it. It can take up to a year, and sometimes even many years, to generate a full time income from affiliate marketing. It depends on many factors that will have an influence on your income.