I don't know if this is class actionable, but ResellerRatings.com has a policy of raising prices by 150% on existing customers only AFTER they have reached a threshold of reviews. Not certain if it is total reviews or reviews/months.
Their site on page https://www.resellerratings.com/merchant-member-pricing#2 indicates "a dynamic system for determining tier"
We've been a customer for years and our growth has been steady, however a 150% raise is rediculous and unwarrented. What possible data points could switch so drastically that it would incur a fee raise of that magnitude.
Warning, you may find yourself getting Ripped Off by ResellerRatings.com. Merchant Beware.