There are many factors to consider including age, health issues, hearing capabilities, finances, time, etc. Then there are responsibilities and commitments. So based on these and many other factors audio can be a hobby some and for others it can be the only meaningful thing in life. There is no right or wrong here, just that some are very fortunate to be able to spend and keep "improving" their hifi audio reproduction. Others are fortunate enough to put a system together within their means and commitments.
It is difficult to say there is something inherretly wrong with the desire to change equipment as opposed to those who have put together their dream system don't see the need to change any further. In the end we all get to enjoy what we can afford.