In the last couple of days, I took my 3000th picture with my Digital Rebel. Based on my assumption that if I were using film, film+developing would cost at least $.50 per picture, this means that I've 'saved' $1500 by going digital, which in some sense justifies the $1500 I spent on the camera and accessories.
Of course, if I were using a film camera, I would not have taken anywhere near 3000 pictures in ~5 months. But, while I won't claim that all 3000 pictures I've taken are good, there are only a very few that I actually didn't want to take.
It feels good that I can point to this and say to myself, "Look, that money wasn't wasted," because this camera is far and away the most expensive thing I've ever bought that was strictly a toy, without the excuse that "I need it for my job" that helps me justify the expense of my computers.