Our expectations are getting higher and higher everyday. People who are from India can relate to the analogy I am going to give.
Few years back before Reliance Jio plans came, We are spending way too much for the 3G/4G, voice plans, rate cutter and sms also. After Jio came, we began to get 1GB 4G data, unlimited calls,sms all at cheap plans. We are happy initially. Now again we have started complaining about the data not sufficient for the usage. Just think about it , one thing which made you happy before is not enough now.
Like this in life We are setting our happiness way too high as we experience more things. Our expectations might motivate us to do more sometime,but most of the time its shouting we are not happy with what we have now at our face.