If you have read enough about affiliate marketing or have not directly jumped at this topic point then it would be easy for you to understand that it takes a good amount of time and hard work to first of all make engaging stuffs that should give something extra knowledge to the visitors that they are actually looking for on the internet. As you have read earlier it's all about trust between the marketer and the consumer and if you really think that you have gathered good information and knowledge from that website then you can think of making a purchase from their affiliate links or you can at least share that source of information on social media or with your friends so that the website remains motivated. Second thing you can do and which is the best thing to do is to donate to that website and specially do this if you are using free and open source things or products. There are many websites which would not like to take donations but are providing good information and knowledge so it is best to purchase from their links whenever you decide to purchase.