Look at it this way - how many of you have a nice car? or change your car, not because it's fallen apart, but because you want a new one?
What about your clothes. I bet you don't wear them until they fall apart and then buy one replacement item - you have a pair of trousers, why buy another pair?
Your home - do you have nice things? Do you buy better, or different things? Do you change your colour scheme?
hairstyle?
Shoes? How many pairs have you got? You've only got one pair of feet.
Handbags? What a waste of money they can be.
Everyone's got something they like to buy lots of or change regularly, or admire.
Ok, I personally think there must be better things than pushchairs, but that's only my opinion. I used the same pushchair until it fell apart but I can understand that there are some folks who have an obsession like some of you have 60 pairs of shoes, or some of you pay £200 for a handbag.....