As an affiliate marketer, you face many problems because you are not in control of what you sell. You can’t control the way the products is sold and handled. Merchants usually promote the products trough different channels and you will lose commissions because the buyer was also referred by another affiliate or trough another campaign.
Affiliate marketers can live with all these. But there is a thing that annoy us a lot. When a merchant change the affiliate network. From time to time, some merchants decide to move from an affiliate network to another. This means that you have to change all the links you have. To prevent this, you should use a link cloaker, but if you used many links from the same merchant and he moves, then you have to invest a lot of work to get the links working again.
Disclosure: Some of the links in this post are "affiliate links." This means if you click on the link and purchase the item, I will receive an affiliate commission