I'm getting into photography, and believe me, it is not hard to drop a lot of money on camera equipment ... and then decide I want (need??) even more camera equipment to accomplish what I want to do.
And for Rowan and me, it's not just about upgrading (although that's part of it), it's about buying whole new and different bicycles for different purposes. Last year it was a tandem. The year before it was titanium bicycles. This year it is two new touring bicycles. And on it goes ...