Would you take an hour of the most excruciating pain for an hour of the most intense pleasure?
Our evolutionary ancestors needed to experience pain more intensely because it prevented them from dying. What does pleasure provide, when it merely acts as a tool for reinforcement?
You can try to refute my description of the pleasure-pain biology ^ , but once you accept it, I do not see how you could say "Says who?".
^ If you are refuting that, see this text explaining it biologically: https://www.researchgate.net/publication/5498867_A_common_neurobiology_for_pain_and_pleasure