Re point 1: in many cases people actually DO have the sample size if the magnitude of the revenue increase is large enough (e.g. double price and increase conversions - lots of stories about this).
Re point 2: in the end increased revenue from better pricing means you're capturing more of the value you're delivering to customers. but yes, there's a brand decision to be made here between 1 price that you always keep the same vs. a changing price that is more optimal.
Re point 3: companies should always be testing their pricing since external factors don't stay the same.
PS: this is also on the blog of a dynamic pricing company so they don't want the people on the fence about handing over pricing control thinking about a/b testing price haha.