They should because you Youtubers miss lead all the time. Like hot chick as the icon and the youtube video has nothing about a hot chick.
I don't have an issue with Steam not accepting other companies reviewers. Steam pay for there data base not any other 3rd party mob, its there choice if they choose to spend extra on data from those who didn't buy it through there store. And a review doesn't use much memory but its steams memory not the 3rd parties, so if you want to review a game on steam buy it through steam or go review it on the site you bought it from. All seems logical to me, someone has to pay for it at the end of the day.
Honestly speaking I don't have any experience to buy anything from steam, because I buy my mostly things from Reecoupons, but my friends prefer to buy from steam and they said good about it.