A final reason is that many SEO software packages are not very (at all?) effective. I recently saw software for sale to generate blog links. Personally, I get a little suspicious when you also get an offer to sell the software yourself. Before you know it, everyone’s trying to sell the same piece of software–even producing templates where you only have to change your name or a few other pieces of info. Check out this screenshot of an auction I saw:
Notice the pink text? That’s where someone was supposed to fill in their own name or other details. For the auction that I checked on, the seller didn’t even bother to personalize the stock template! Instead, they’re taking something that they bought and trying to sell it to you without customizing it with even their name. Now at the point where people are buying SEO software and turning right around and trying to sell it again without modifying even a template HTML page, what’s your opinion of that software? Also, did you notice the misspelling in the template about “quite that day job”? I usually get skeptical about typos when I’m about to buy something.
Maybe this is a useful piece of software. I could buy the software for $4.89 and check it out, but instead I’ll just stick to some high-level advice: for all the reasons I’ve mentioned, carefully consider any piece of SEO software before buying it.