Why should anyone not copy-and-paste? After you've typed something out a dozen times, you start to notice the inefficiency of typing it out yet again and either refer someone to an earlier post or copy an earlier post with a few comments particular to the individual as appropriate.
What's more, if something is copied from elsewhere, the reader has some confidence that others have already read and commented on the data.
Regarding certain products and the accepted duping of newbies, many of us hold our own ideas of the mentioned products but we're hardly in a position to send warnings to every passing fresh username, especially when the site is is lending it's reputation to the products. I won't even get into the underlying concern that any post against a sponsor's products might carry a penalty of being banned, no matter how much outrage one might feel.