The problem is that such a state of affairs is impossible. If people actually started paying for subscriptions, the ads would disappear only temporarily. Eventually companies would realize "Sure, they're paying subscription fees, but if I just put a little unobtrusive link to 'related products' in the sidebar, no on will complain. And, yeah, sure, I'll get a little extra money on the side for displaying links to specific (paying) partners..." Soon enough, the ads are back (in some form or other), and we're now paying for the content twice. (We've seen this happen many times before; e.g. subscription cable-TV was supposed to be ad-free. More recently I've noticed that digital downloads from iTunes or Google Play have ads for other shows added to the beginning.) Moreover, oftentimes 'ad-free' really just means the ads are less obvious but more insidious (product placement, 'trusted' reviewers being bribed to give positive reviews, etc.).
The simple fact is that we cannot ever trust companies to actually honor the social contract of subscription models. Since they cannot stick to the rules, the only option is for end-users endure the constant ads, since at least in this case we don't have to pay subscription costs.