Exactly Mark! In my experience you can certainly write around 1000 words per hour, even if you are practically new to blogging. I personally think that spinning articles is just a gimmick that doesn’t really get results but wastes tons of time. The spinning software certainly makes a lot of money for the creators though! They are the ones who are laughing all the way to the bank!
Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article.