Why can't the saints wear their retro jerseys?

It's weird how in that one season (2002) the Saints went crazy with retros, alternates, all blacks (before any other team did it), gold jerseys, etc.

Then after that - nothing. No alternates, no retros, nada.

I don't understand why an NFL team would hesitate to come out with different looks - it creates a whole new merchandising opportunity. There were Eagles fans at the game yesterday wearing those horrible light blue and gold throwback unis that Philly wore last year.

The only thing the Saints do to mix it up is gold pants v's black pants - but that's not even a big deal because fans don't buy pants.