Affiliate marketing is not for the weak! Of course you may or may not be able to get a qualifying sale of 3 orders. Of course you spend 99% of your time trying to get a sale and promoting the links to try to push it so you make it.
Of course they can end up closing your account and or taking what you have earned and claiming it's for maintenance. I personally hate affiliate marketing.
It is the worst and not only that but keeping up with all the sales, links and so much more is not worth it. It is like you're loosing a piece of yourself and your sanity if you try to do this as a career.
This is only for a side income not a main since you may never make it to big dollars only cents.