How common are errata pages in tech books?

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I spent £30 on a book only to later findout it has numerous errors, though the reviews I read didn't indicate this. I managed to locate the errata pages which totals around 20 confirmed errors. How common are these errata pages?

 

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It happens mate, I have had books that have had very obvious mistakes, it's one of the reasons why I prefer Kindle books now days, at least they get updated occasionally.

 

Pretty common these days, lifespan for tech books is extremely limited.

You used to get third and fourth editions and the bugs would get ironed out, doesn't happen these days, you get a link to a website with errata.