I have observed this in so many people of so many different backgrounds so I know it's not a culture thing - it's a human condition.
Nothing makes us happy for too long, not those gorgeous boots that look so sexy or the 10 lost pounds or that amazing new game we played. We get hooked, we conquer it and then it stops giving us the same happiness.
Happiness is a totally separate issue so perhaps I should leave that out right now, I am going to limit myself to interest. There are things that we can't wait to do, that are irresistible to us, we are obsessed yet when after a lot of effort they become part of our lives and routine they simply stop being as appealing to us.
Is it because they have become our routine that they stop being exciting?
Perhaps Economics would explain it better than psychology or philosophy - is it merely a case of diminishing returns?
This famous law was first written about by a Frenchman, Anne Robert Jacques Turgot and then alluded to by Thomas Malthus in his Essay on the Principle of Population (1798).
After getting those lovely boots and wearing them a couple of times or driving that sexy car, a point comes when the thrill kind of dies down. We become used to it.
When one of the factors of production is held fixed in supply, successive additions of the other factors will lead to an increase in returns up to a point, but beyond this point returns will diminish
Psychology would explain it as perhaps the human nature to want to conquer and once that need is met and the prey captured, interest lost.
I wonder why it happens though? What do you think