Jason,

I think you're right on one hand IF you specialize in too narrow a niche... for example if your specialty was creating sales letters for only Morgan Silver Dollars, then yes you could be walling yourself into a niche that is too tight.

But if you're a specialist in creating sales letters for "collectibles", then you're probably going to be just fine.

I think Dan Kennedy is right when he says, "Jumping up & down in puddles will have more impact than jumping up & down in the ocean."

And what does he mean by that? Dominating a niche, say creating sales letters for subscription renewals is probably going to be more financially rewarding for the copywriter, than saying that you can write a sales letter for any product or service on the planet. Just like in medicine, specialists get paid more than GP's.

I think this specialization is even more important for marketers. Look at Joe Polish or Rory Flatt. I just can't imagine those guys having anywhere near the amount of success they've encountered if they were just another generic marketing consultant willing to help any business no matter what it is.

Both dietary supplements and real estate are huge, huge niches. I just can't see them going away.