why people like to reinvent wheels

I'm working on a new projects. I created a new package, and was debating if I should reuse some of the classes that I wrote for the previous project.

Then I suddenly have this feeling that it's just so much easy and less messy to rewrite the basic classes for this new project.

And it not only feels more straightforward, but also more fun!

I know why people like to reinvent wheels... :-/