You missed where he said "use it properly". Xrumer is stupid powerful IF you are an expert with it. I used it for 2 weeks and could barely figure out how to do Mass-PM. It has potential to figuratively rape every website. But again, "use it properly" is the key. If you actually KNEW how to use Xrumer to its fullest extent, you would LAUGH at how low its priced.
Again it may be objectively worth $590, but it's not worth it to me... it requires as insane amount of dedication and list tending, which is a giant time sink. I have used it myself, and got fairly "far" with it I guess you could say, but I decided against buying it because, simply put, it just didn't do it for me.
It's no scrapebox, and the links it generates are very difficult to get indexed these days.
Scrapebox is in an entirely different league, once you know how to use that tool, you'd probably think Xrumer was the joke (considering the price difference)....
The power of 7 instances and 500k d0follow AA lists (once you know how to scrape such a thing) is beyond comparison.
Also the cost of xrumer use is much higher than at first glance, even with my fibre it hogs everything... it needs a dedi, and that's another $50-70/mth
Once you have created PR4-PR8 d0follow lists 1000-1500 domains strong, Xrumer's brute force approach is just... yes I saw the power of it, but it's not elegant, long term or unbeatable as so many other things I do...
Time is the one thing I don't have plenty of.
Perhaps I'm thinking in my box, but my box is very cozy and high paying... I don't do email spam, PM spam, to generate leads. I don't do much CPA... I just create authority sites, usually aimed at niches with >$2mill/yr revenue