How would you object to the claim that there can be ice-creams of different quality (such that a little bit of one kind of ice-cream is much better than lots of another kind of ice-cream), if ice-cream is the only valuable thing?
“The creed which accepts as the foundation of morals ‘utility’ or the ‘greatest happiness principle’ holds that actions are right in proportion as they tend to promote happiness; wrong as they tend to produce the reverse of happiness.”