I did split tests with several affiliate programs in the niche, at first with small budgets, then it slightly increased, I've been working for a year and a half, in the offseason I almost do not drive traffic. As for the cons, the average check is not the highest, I personally got $50
In other affiliate programs sometimes sometimes it was bigger, but this is a feature of the service, the target audience of students who are looking for cost-effective service.

Despite this, the conversion (which is usually bigger than in similar affiliate programs) + rebills pay off this minus.
Finally, let me show you the frequency of rebills in the offseason for a few days in June: