-Because time is also a factor.
Time is comprised of duration and frequency. And with time, the law of diminishing and negative returns inevitably applies to our utilitarian calculus. In other words, there can be not only too little but also perhaps much of a good thing, possibly measurable in units of time. But the detriment may conceivably be reduced if not eliminated by increasing any of the other resources.
Nevertheless, the resource of time remains finite to any single individual, and happiness must then be delegated, shared, and if the saying is true, doubled!
Indeed, the happiness equation may be applied to relationships and social life. For what value are either, joyless, detached and meaningless?
Hence, social success ≠ happiness. Indeed, somewhat robotic even if purportedly reliable procedures for fitting in and meeting new people are known actually, nonetheless, to exacerbate boredom and loneliness, because not everyone finds therein, any pleasure or meaning in which to engage. And so it should come as little surprise should the requisite social skills and hence degree of success correlate with that of allure and enthusiasm to the task.