And you know the average player doesn't do stuff like get herbs from their garrison how? lol. Only the top players know how to make followers that get extra gold from those garrison missions? lol come on man, don't waste my time here. And this is a big part of the reason why a lot of people don't like WoD in the first place, garrisons are awful gameplay.
Doing a google search on something isn't "advertising". That is something you actively have to seek yourself. That being said you are still ignoring the fact that people have literally tens of thousands of options for free games to play so if they wanted to simply play something for free, why would they choose wow out of all of the other options? Again do you play games because of the price or because you have fun playing them? Let's get at least an honest answer from you on this one.... Word of mouth only? Go to Google and type "WoW private server" and you'll get a big list of not only WoW private server pages, but also Top 10/100 lists of WoW private servers. The existence of illegal servers is common knowledge, and to find one is very, very easy. But again, mentioning other non-WoW games is irrelevant, because they're not WoW. Otherwise, on the same token, I could point out that since Hearthstone has over 10 millions players, and since it is free, I could say yes, "being free" is a huge motivator.
There are a lot of reasons why private servers aren't as popular, they are illegal and have zero advertising. That being said vanilla actually had more subscribers then WoD, despite "advancements".... and I use that term loosely. Did you ever try buying a mount, for example, in vanilla? Gold was far more rare than today. Watch the garrison video again lol. I bring up communities because some people are looking for that in an MMO. And if that's not your thing, more power to you, I'm merely explaining why some people think vanilla is superior to WoD.Except I am not comparing communities. I'm comparing the game's original mechanics and design. A vanilla game (1x across the board) then is the same as today. And if you're going to say they're 'more successful', try again when the number of people playing a private server is bigger than the number of players on retail. And how exactly does Vanilla 'encourages making smart sales and purchases', really?