Yes, though there is a free 2 week free trial (or 3 week if you get a referral link form someone that is an active subscriber).
The fee afterwards is between $15 and $19 per month, depending on if you buy the game time from CCP directly or through an official third party website. You can also pay for game time with a Pilot's License Extension (PLEX). This is an ingame item that can be bought with either ISK (in-game money) or real money through CCP.
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No, there is no monthly fee. You buy it one time and if you want to play on someone else's sever all you need to know is their IP address, the one that they go online with.
Yes, the monthly subscription fee is $15
Minecraft costs $26.95 and there is no monthly fee.
No, DC Universe Online requires a permanent internet connection as wel as a monthly fee for PC to play it.
No, there is no additional fee.