I hope you do not get downvoted, for providing a different point of view. However, I think the important thing to look at is the ratio of useful input on this site to "selling stuff". With patio11, it's very high: he provides tons of useful advice and information, and rarely out and out just "sells stuff". So when he does... well, great, good for him, let's hope it works out!

If on the other hand, someone only comments to promote their own products, I'd look a bit more askance at that.