There are many reasons why I do not personally want children.

Some are political or philsophical that would take too long to explain here but I suppose one big reason is that I just flat-out do not like being around children.

There are no economic or personal incentives that would change my mind on this matter and from what I understand, the number of people thinking this way (the not wanting kids in general part, not the not liking them part) has gradually increased over the years as living standards have improved and more people are able to fulfill other goals and personal ambitions.