You've misread my post so let me rephrase it: a gold subscriber gets more sales than a non-gold subscriber on XBL; some sales are gold only others open to all.
No you don't. MS just don't let you do much online stuff without it - stuff that every other provider lets you do for free. (youtube, browser, netflix, lovefilm etc...)
Also you do get general (no Gold required) sales on XBL these days, and have for so for a couple of years. You just get more with Gold.
No one would claim XBL gives non-gold subs more than PSN.
Why look, it's a blog: