WoW private servers crash often, do not generally have friendly GMs (usually server owners friends), really bad economy, and can be full of bugs and what not. it is better to just pay the fifteen dollars a month and play on the official servers.
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No, you do not have to pay to go on World of Warcraft private servers. But if you want to Donate money to your private server developers you can and in most private servers donating gives you the best gear you can get. I recomend going on WoWlegacy private server or WoWBeez private server, they are both very good private servers for PvE and PvP.
For Warcraft III a World editor comes with the expansion pack, The Frozen Throne. no Official editor has been released for World of warcraft. This is probably because of Wow's use of .adt's and that everyone must use the same .adt's for it to work, for a private server this can be done with a adt editor, but you'd have to give all of the players on that private server your world folder ( 34.6 MB ) Yikes! -Konnor J. Patterson
Technically, private servers are illegal for World of Warcraft. Nevertheless, many people still play on private servers.
All private servers are "legal" in that they are not breaking any laws. However, Blizzard considers private servers a violation of the Terms of Service of World of Warcraft in general, and therefore, any private servers are actually in violation of Blizzard Entertainment's Terms of Acceptable Use for their software. In other words, private servers are like pirated software, and you should always be careful to be sure your username and password on a Private server NEVER matches any other username/password combination you have elsewhere online.
No, you can not play World of Warcraft without a subscription unless you play on illegal private servers that are not supported by blizzard. These servers can be much more buggy and you will be kicked off the server many times because the server itself crashes many times and generally by an all around mess. EDIT: you can now play World of Warcraft for free until level 20.